TESCH— PTEROPODA AND HETEROPODA 179 



Admiralty Islands and Japan. By the Sealark it is now recorded from the Amirante 

 Group *. 



Cardjapoda d'Orbigny. 



12. Cardiapoda trachydermon Tesch. 



Stat, hh (l), N. of* Darros Island (Amirante Group) ; one specimen (?) of about 

 30 mm. from tip of the proboscis to end of the tail. "Investigator" specimen : 40° 13' N. 

 93' 40' E. 370—419 fins.; one specimen (?) with a total length of 28 mm. 



I have very little to add to my former accountf of this species. I have found 

 tubercles, cutaneous glands, tentacles, tail, fin, and radula quite similar to those of the 

 Siboga specimens. The right tentacle is somewhat smaller than the left, and both are 

 innervated by a small nerve, issuing from the top of the central ganglia, as will be 

 described in the following species. Here I must state that my former figure of the eye 

 of this species is not quite sufficient, as the distribution of pigment and the general shape 

 of the eye, as it was designated by me, needs some rectification, which will be given in the 

 figure of the next species. 



I think the Carinaroida placenta Souleyet \ must be the same as this species, judging 

 from the general shape of the body and the length (35 mm.), though it is almost impossible 

 to obtain absolute certainty, without renewed investigation of the type-specimens. These 

 were found in the tropical Atlantic and near the Sandwich Islands. 



13. Cardiapoda sublcevis Tesch. (Plate 12, figs. 4, 5.) 



Stat, y (l), Providence; mm (l), Desroches Atoll, Amirante Group. At the first 

 station was found a ?, at the second a $, each with a total length of 13 mm. 



As I pointed out in my former paper§, this species closely resembles C trachydermon. 

 The general appearance is exactly the same, and the only difference consists in the total 

 absence of tubercles on the skin, and perhaps in the three cusps of the central plate in the 

 radula being of equal length, whereas in C. trachydermon the lateral ones are smaller than 

 the median. Yet the specific distinctness of the two species may seem to be not suffi- 

 ciently established, as perhaps the presence of tubercles is due to advanced age (the 

 specimens of C. trachydermon measured from 30 to 35 mm., those of C. sublcevis from 

 12 to 25 mm.). 



I have figured (fig. 4) the eyes which are of the same general shape as in the 

 Carinariidse. They are rather large, much depressed, with a round lens (le) and the 

 usual distribution of pigment in the hinder part. The retina extends along the whole 

 distal margin of the eye, and is connected with the cerebral ganglion by a strong but 

 short optic nerve (ne), showing elongated swellings at both ends. The eye itself is 

 surrounded dorsally and laterally by the skin which is considerably raised, thus forming 



* After the above description had been written, I became acquainted with a short note by Raff. Issel on 

 " Aloysia phyllosoma" (Un nuovo genere di Molluschi Eteropodi, Monitore Zool. ilal. Anno XVIII, No. 7, 

 pp. 174 — 176); this Aloysia, as may be inferred from the description and the accompanying figure, is a young 

 Pterosoma, as indeed the author himself communicated to me by a letter. (Note added during press.) 



t I.e. p. 77, PI. x. fig. 52, PI. xi. figs. 53—56. 



X Voyage de la " Bonite," Zoolotjie, T. ii. p. 353, PI. xvn. figs. 1—10. 



§ I.e. p. 78, PI. xi. figs. 57—59. 



23—2 



