130 MOLPADIIDAE. 



cuius. Such a course now seems illogical and the acceptance of Cuvier's specific 

 name is the most satisfactory solution of the difficulty. There is little doubt 

 that Cuvier and Risso were dealing with the same species and since Ludwig 

 has clearly shown what the species is, described as musculus by Risso, that 

 species ought to bear Cuvier's name. 



The species has a wide distribution and probably the name in its present 

 sense really covers several valid species, but the specimens in the present col- 

 lection throw no light on the matter. They range from 30 to 115 mm. in length. 

 The smallest have very insignificant caudal appendages, relatively few phos- 

 phatic bodies, and many anchors; several are evidently Ankyroderma spinosum 

 Ludwig. The largest specimens are quite red from the crowded phosphatic 

 deposits, and their caudal appendages are relatively long. 



The two colored figures given, obviously do not represent a single species. 

 There is little reason to doubt that Plate 3, fig. 1 represents an adult holothu- 

 rioides, though the color is more roseate than would be expected and the absence 

 of a caudal appendage is notable. But Plate 3, fig. 5, while almost certainly 

 a Molpadia can hardly be holothurioides. The figure is published in order to 

 record the occurrence in the Eastern Pacific of a holothurian, having this most 

 unusual green color. The drawing is based on a specimen recorded from sta- 

 tion 4630, but there is no molpadiid in the collection now from that station; 

 at 4631, however, M. holothurioides was taken. 



Station 4631. Panama: off Mariato Point, 72 miles. 774 fms. Bott. temp. 38°. Gn. s. 

 Station 4651. Peru: west of Aguja Point, 111 miles. 2,222 fms. Bott. temp. 35.4°. Fne. stky. gy. m. 

 Station 4672. Peru: southwest of Palominos Light House, 88 miles. 2,845 fms. Bott. temp. 35.2°. 

 Fne. dk. br. infus. m. 



Twenty specimens. 



Ceraplectana trachyderma. 

 H. L. Clark, 1908. Apod. Hoi., p. 39. 



The rediscovery, off the coast of Peru, in very deep water, of this remark- 

 able holothurian hitherto known only from the type-locality in the vicinity of 

 the Aleutian Islands, is one of the interesting results of the 1904-1905 expedi- 

 tion. The specimens are in very good condition, except that one has all but one 

 of the curious horny tentacles missing; apparently they have been torn off. 

 The larger specimen is 52 nun. long and 17 mm. in diameter, with a caudal 

 appendage about 9 mm. in length. The smaller specimen is about four fifths 

 as large. The color is gray finely speckled with brownish red, but the oral disk 



