82 



Paraclione n. g. 



Closely resembling Clione^ but distinguished from it by the absence of the posterior lobe 

 of the foot, and by a rather long spine in the median tooth of the radula '). 



Description: the body is elongated, but not so much as in Clione-^ terminating into 

 an obtuse jjoint, separated from the rest of the body by a constriction. Visceral mass not 

 extending towards the extremity; between the visceral mass and the skin branched connective 

 tissue is well developed, especially on the right side of the body. Head broad, bilobated, 

 separated from the trunk by a short neck. Anterior lobes of the foot broadly attached ; no 

 tubercle between them ; posterior lobe (|uite absent. Fins broad and rounded at their distal 

 extremity. Buccal appendages conical, inserted at the outside of false "lips". Hook-sacs with a 

 few hooks; no jaws. Radula with a median tooth which shows a slender spine, springing from 

 the proximal margin of the tooth, but directed distally. 



I. Paraclione pclscneeri n. sp. (PL V, figs. 147 — 152). 



Stat. 36. 7° 38' S., 117^31' E. I spec. 

 .Stat. 213. Saleyer Island. 3 spec. 



Stat. 223. 5°44'.7S., 126° 27^3 E. i spec. 



Body: as described above for the genus. As may be seen from the figures, the 

 shape of the animals differs considerably, but this fact is partly due to contraction, partly to 

 the more or less development of the connective tissue beneath the skin. In one specimen of 

 Stat. 213 (fig. 148) this tissue is especially well developed on the head, which is therefore much 

 larger than in the other specimens. Two sjjecimens of Stat. 213 and one of .Stat. 223 (figs. 148, 

 149) present chromatophors, disposed in the same manner as in C Hone punctata^ the skin itself 

 being therefore quite without pigment and only provided with unicellular mucous glands, chiefly 

 crowding in the neck, and above the cloacal depression. The point in which the body terminates, 

 bears beneath its epithelium on the surface, a rather strong layer of annular muscular fibres, 

 at the inside of which several longitudinal muscles spread over the body-wall. ISy the la\'er of 

 annular muscles is the aboral pole more opaque than the rest of the skin. 



Foot: the anterior lobes are broadly attached; in the specimen of Stat. 223 (fig. 149) 

 these lobes are a little deformed and curled outwards. They are free for about one half of 

 their length. A posterior lobe is absent. 



Fins: rounded at their distal extremity. 



Buccal appendages: two pairs, in.serted at the outside of false "lips" (fig. 152); 

 the dorsal is smaller than the ventral, but of course I cannot say whether this difference is a 

 specific characteristic or a generic one. As the animals are e.xceedingly small, it is necessary 

 to make transverse sections through the head, if one intends to e.xamine the disposition of 

 the cephaloconi. 



i) It must be noted, that Macdonai.d (Transact. Koy. Soc. Edinb., vol. XXIII (1S63), pi. IX, fig. 3,1-) also represents the 

 radula of "6V;o caudaia"^ as possessing a median tootli with a long spine. Unfortunately, however, the foot has not been described. 



