100 



ed with a short and broad mandible, having a 

 curved, blunted point, with four or five close- 

 set somewhat acute and curved denticles, situa- 

 ted within its middle half; posterior extremity- 

 rounded, orrifice of the canal distinctly seen on 

 its end. Length of mandible contained about 

 seventeen-times in length of the body. Breadth 

 of body about l-77th its length. Mag. 460 di- 

 ameter's. Found with the preceding. 



L. magnas. ng. ns. — Trask — Plate 6, 

 fig. 3. — Lorica smooth, arcuate, gradually taper- 

 ing from the anterior to the posterior extremity. 

 Anterior end terminated by a wide, pointed beak 

 on the ventral side, and a small rounded process 

 on the dorsal, armed with a broad curved man- 

 dible, having a hooklike end, and a large point- 

 ed denticle near the middle ; posterior extremi- 

 ty narrow and rounded ; body tapering for near- 

 ly its entire length, compressed, transverse sec- 

 tion oval. 



Length of mandible contained about nineteen 

 times in the length of the body. Breadth of 

 body l-22nd its length. Mag. 400 diameters. 



Santa Barbara. Matsmai, Japan. On lim- 

 pets and among the roots of zoophytes. 



L. falcata. ng. ns. — Trask. — Plate 6, 

 fig. 4 — Lorica curved, anterior extremity very 

 unequally furcate, the ventral side being pro- 

 jected into an acute long rostrate process, and a 

 very small angular beak on the dorsal ; armed 

 •with a somewhat narrow sickle-shaped mandi- 

 ble, which is finely denticulated for little more 

 than half its length ; posterior extremity termi- 

 nating in a naiTow sharp point ; body tapers 

 uniformly throughout its length, much com- 

 pressed. Length of mandible contained about 

 eight-times in the length of the body. Mag. 

 540 diameters. On limpets. Japan, Island 

 Mastsmai. 



L. — var. (?] Plate 6, fig. 5. — This at most 



is probably but a variety of the proceeding. I 

 think it will prove a younger individual of the 

 last species ; it bears a strong resemblance to L. 

 falaata. Mag. 540 diameters. Found with the 

 preceding. 



L. glabrescus. ng. ns. — Tr.vsk — Plate 6, 

 fig. 6. — Lorica arcuate, anterior extremity widen- 

 ed, subacute beak, and two smaller processes op- 

 posite, the one more prominent and acute than 

 the other ; body tapers from anterior extremity 

 to posterior, the latter terminating in a narrow 

 rounded end, much compressed ; mandible very- 

 long, subulate thin, smooth upon both edges ; 

 length of mandible contained about four- 

 times in the length of the body ; breadth of 

 body nearly l-28th of its length. 640 diame- 

 ters. 



On Ostrea, Gulf California and Manzanillo. 



L. scmircctas. ng. ns. — Tiia.sk — Plate 6, 

 fig. 7. — Lorica slightly carved for little more 

 than one-third its length from the anterior end, 

 becoming nearly rectilinear for the rest of its 

 length ; anterior extremity formed of rather a 

 bluntly rounded wide rostra on one side, and a 

 sublanccolatc process opposite ; a broad rib-like 

 lobe extends from the apex of the beak obliquely 

 across the anterior end, and raised above the sur- 

 face on which it rests; body contracts from the 

 anterior portions to the posterior, which termi- 

 nate* in a rounded end, canal central, mandible 



curved, and obliquely connate, very finely den- 

 itculate, no aperture observed on the posterior 

 end. Mandible contained about eight times 

 in the length of the body. Manzanillo and Gulf 

 of California. On Ostrea. 750 diamters. 



L. incurra. ng. ns. — Trask. — Plate 6, fig. 

 8. — Lorica curved, smooth, anterior end project- 

 ed into a short acute rostra, and a small, sharp 

 process on the opposite side ; posterior extremity 

 rather obtusely rounded ; mandible slightly- 

 curved on one side, nearly straight on the oppo- 

 site, without denticles. Canal central. Man- 

 dible contained about five times in the length 

 of the body. Manzanillo. On Ostrea. 1000 

 diameters. 



L. attenuata. ng. ns. — Trask. — Plate 6, 

 fig. 9. — Lorica straight, narrow, gracefully con- 

 tracting from the anterior extremity to the pos- 

 terior, which latter is capitate. Anterior end 

 unequally bifid, forming two bluntly rounded 

 beaks, in which is inserted a narrow, subulate 

 mandible. Canal central. Xo denticles were 

 observed on this species. Manzanillo and the 

 Gulf of California. On Ostrea. 1000 diameters. 

 These new forms,now for the first time figured and 

 described, constitute some of the most beautiful 

 organisms to be met with. The fineness of the 

 denticulations on the mandibular process well fit 

 them for test objects for the microscope. 



From the localities above named it will be 

 seen that they occupy an extended geographical 

 range, being found from Mexico to the coast of 

 Japan. They are not plentiful, so far as obser- 

 vation at present extends, yet sufficiently so that 

 I have been enabled to obtain a dozen specimens 

 from one or two ounces of material. I have met 

 with the best success in specimens of alga; and 

 shells, from depths from four to six fathoms. A 

 good locality' for obtaining them frequently is 

 from the large mytilus, found only at very low 

 tides on this coast, more particularly on shells, 

 to which sertularia and other zoophytes are found 

 attached. I have met with them from Monterey, 

 Bolinos and Tomales — from the two latter places 

 attached to laminaria, and about the roots of 

 plumularia on stones. A locality in the Bay of 

 San Francisco, that furnished specimens last 

 year, has not produced any yet this season. 



Dr. Trask read the following paper on nine 

 new species of Zoophytes from the Bay of San 

 Francisco and adjacent localities : 



Gexus Sertularia. Lixx. 

 Sertularia anguina. Trask. Plate 5, fig. 1. 

 Polypidom erect, one to three inches high, alter- 

 nately branched and pinnated, color corneous ; 

 rac -his tortuous, jointed, with two cells on each 

 intcrnode, and four between each branchlct; 

 pinna jointed, two cells on each, placed some- 

 what sub-lateral and forward, nearly opposite, 

 aperture free, with oval smooth margins ; cells 

 attached by a broad strong base, at the insertion 

 of which a slightly raised rounded riiii; is appa- 

 rent. Its affinity is with that of S.fallax, (John- 

 ston,) more nearly than with any other species 

 with which I am acquainted, and at first sight 

 would easily be msstaken for that species. Its 

 ovarian vesicles have not yet been seen. 

 . Plentiful on a large mytilus brought to our 



