OF THE EUCHXANLDOTA. 



695 



Patella -vvdth or without red dots ; so also the Metopidia Lepadella and Sqiia- 

 mella bractea are the same, and what we name Lepadella rotundata. More- 

 over the Squamella ohlonga and Metopidia acuminata are two distinct species 

 of Lepadella.''^ 



Lepadella ovalis (BracJdonus oralis, 

 M.). — Lorica depressed, oval, not emar- 

 ginate, attenuated anteriorly, the ends 

 truncated. The alimentary canal of this 

 animalcule is generally filled with a yel- 

 lowish substance, except when it feeds 

 upon colomiess Monads, (xxxiv. 430, a 

 back view; 431, a side (right) view of a 

 young specimen ; 432, the lorica 

 oesophageal head.) 1-240". 



433, the 



L. emarginata (Brachionus Spatella et 

 ovalis, M.). — Lorica depressed, oval, 

 broad anteriorly, extremities emargi- 

 nate. Amongst Confeiwse. Length, 

 without foot, 1-576". 



L. (?) Salpina. — Lorica oblong, pris- 

 matic, obtusely triangular, back crested, 

 denticulated. Amongst Confervse. Length 

 of lorica 1-200". 



Genus DIPLAX (Gosse). — Eesembles Salpina ; but the eye is wanting, 

 and the lorica (which, as in that genus, is cleft doTVTi the back) is destitute 

 of spines both in front and rear ; foot and toes long and slender. It forms a 

 connecting link between Salpina and Dinocliaris. The name, signifying 

 double, alludes to the gaping lorica, which forms two parallel plates. 



In accordance with the tabular disposition of the family, this genus follows 

 next after Lepadella. 



DiPLAX compressa. — Form of lorica 

 (viewed laterally) nearly a parallelo- 

 gi'am, greatly compressed. Lorica 1-176". 



D. trigona. — Lorica three-sided, a sec- 



tion forming a nearly equilateral triangle, 

 sm^face delicately punctm-ed or stippled j 

 toes long and slender. Lorica 1-160". 

 Leaming-ton. 



Genus MOjN^OSTYLA (XXXIY. 434-437). — Eye single, cervical; foot 

 simple, styliform ; lorica (testula) depressed, ovate. Numerous muscles have 

 been noted in two species — the oesophageal head has four muscles ; in one 

 species the jaws are single-toothed, in the other two-toothed. QEsophagus 

 very short ; stomach constricted (Gasterodela), with two glands. The ovary 

 is globular ; an ovum, with the vesicle of the germ within it, was seen in two 

 species. No male organs, vessels, or respiratory tubes, are seen. Owing to 

 the almost constant vibration of the foot-like tail, it is difficult to observe the 

 true form of its termination, the motion producing an optical deception; 

 hence it appears double, though in reality it is single. 



MoNOSTYLA cornuta (Trichoda cor- 

 nuta, M.). — Lorica hyaline, unarmed, 

 and trimcated anteriorly. Amongst 

 Charae and Confervse. 1-250". 



M, quadridentata. — Lorica yellowish, 

 anteriorly deeply dentated, resembling 

 four horns. It is generally of a yellow 

 leather colour, but Ehrenberg has seen 

 it colom-less. (xxxiv. 434 & 435, ventral 

 aspect; in the latter the animal is ex- 

 tended beyond its lorica, which happens 

 when the rotary cilia are in motion. 

 Fig. 436, a side view; 437, the jaws 

 and teeth separated.) In floccose matter 



about Confervse and the leaves of water- 

 plants. 1-120". 



M. (?) lunai'is. — Lorica hyaline, flex- 

 ible, admitting the retraction of the 

 head, anteriorly crescent-shaped. 1-144". 

 Colour grey, usually so dark that no 

 internal organs are distinguishable. Eyes 

 red ; jaws large, two-toothed ; eggs few. 



M. Bidla (6osse). — Body ovate, in- 

 flated, the back very gibbous ; lorica 

 plicated on each side, with a deep fur- 

 row ; the occipital and mental deeply 

 incised. Colour yellowish-brown. Length 

 of lorica 1-175". 



Genus MASTIGOCEECA (XXXIV. 438-440).— Dujardin and Perty be- 

 lieve this to be identical with Monocerca. 



Genus EUCHLANIS (XXXIY. 441-446 ; XXXYIII. 5,18 ; XXXIX. 4, 5, 



7). — Lorica resembling a tortoise-sheU ; according to Cohn not slit inferiorly, 



