254 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 48. 



49. MOLPADIA INFESTA, new species. 



Plate 9, figs. 15a, b. 



Station 4812. One specimen. 



Body fusiform, 60 mm. long, including the caudal appendage, 

 which is about 5 mm. in length and not distinctly set off from the rest 

 of body. Color grayish-brown, integument rough to the touch. 

 Tentacles 15 in number, each with a pair of minute digits. Deposits 

 of perisome are tables only (pi. 9, fig. 15a). Disks averaging 250/z 

 in diameter, with a range of 175-3 10ju, usually with 3 holes,' often 

 none, or in some cases with smaller peripheral ones, numbering up to 

 14 in all. Spire is made up of 3 pillars armed with some teeth on the 

 top and sides, and connected with each other by 3 crossbeams, height 

 ranging between 120 and 170/*. In the caudal appendage tables are 

 modified into elongated plates without spire, but often with knobs 

 (fig. 15&). Length of these plates varies 280-380/z, holes numbering 

 from 4 to 20 or more. Phosphatic corpuscles are irregularly dispersed 

 measuring in most cases 30-80/* in diameter. Calcareous ring similar 

 in form to that of M. intermedia. Polian vesicle and stone-canal 

 single. Respiratory trees two, the right one much larger than the 

 other. 



The present species resembles M. clarki but differs from it in some 

 points relating to deposits, from M. intermedia in shape of deposits of 

 the tail, and from M. andamanensis (Walsh) in shape of tables in gen- 

 eral perisome. The specimen is severely infested by a species of 

 Gregarina encysted at several parts, such as radial muscles, mesen- 

 teries, intestinal blood vessels, etc. 



Habitat. — North of Sado Island, Japan Sea. 



Type.— Cat. No. 34163, U.S.N.M. 



Genus CATJDINA Stimpson. 



50. CAUDINA LUDWIGI, new species. 



Plate 9, figs. 17a-c. 



Station 5085. A fragment. 

 Only a posterior part is left, measuring 73 mm. long, 12 mm. in 

 diameter at the thickest part, the posterior two-thirds 6 mm. in 

 diameter throughout. Color dirty white, integument transversely 

 wrinkled, stiff, and very rough to the touch. Deposits very abun- 

 dant, overlapping one another, in two forms but not arranged in dis- 

 tinct layers. One form is spinose and tablelike (pi. 9, figs. 17a, o), 

 with an angular disk perforated with 17-55 holes and a conical spire 

 consisting of 3, rarely 4 or 5, pillars united together by 3 or 4 cross- 

 beams. Diameter of the disk 270-410/*; height of spire 160-200/*. 

 The other form, which is very sparsely found, is a smaller, spinose plate 



