Transactions of the Society. 



uhteta oblonga is small in size, and the shape of the body 



is that of an oblong cone, more or less swollen at the sides ; it is 



white transparent, and the head is distinctly convex in front. 



The exact shape of the body varies somewhat according to the 



locality, the age of the individuals, the abundance or scarcity of 



1, &'c. The integument is very thin, white, transparent, and 



shows numerous very fine longitudinal folds on the dorsal side. 



The foot is short and narrow and carries two small, conical, well 



arated toes ; the foot is usually slightly enlarged at the base of 



i oes, and contains two foot-glands. 



The front of the head bears the usual two pairs of styles, the 

 longer outer pair arising from triangular fleshy flaps. At the 

 reme front are seen two divergent bundles of very fine stiff 

 . which arise from a pimple situated immediately above the 

 month, and which are not present in S. trcmula or gyrina. The 

 auricles are small, slightly pendent, and situated at the ends of the 

 frontal curve of the head. The mouth is in the usual position on 

 the ventral side of the front of the head, shield-shaped, closely 

 surrounded by a single row of very fine, stiff, curved hairs, and 

 with four larger setigerous pimples a little further off at the four 

 c uiiers. 



The dorsal antenna protrudes in the usual position above the 

 eye on a slight eminence, whilst the very small lateral antennse are 

 situated at the sides of the body, on a level with the stomach, and 

 slightly on the ventral side ; frequently they are very difficult to 

 lind. 



The cervical eye is deep red in colour, often appearing divided 

 in two halves, and sometimes in this species two more or less 

 prominent aggregations of red granules occur on the front of the 

 head, and two streams of very minute red granules connect these 

 with the cervical eye, much like the frontal eyes of S. triophthalma 

 and littoralis, but much less pronounced. 



I have taken considerable trouble to dissolve out the very 

 delicate jaws of this species, and believe fig. 10, pi. V. gives a 

 irrect representation of their structure, which is a type different 

 from that of S.pectinata, but common to a number of other species. 

 The malleus consists of a long, thin, curved manubrium, having a 

 broad, very thin, wing-like flange on one side, and a triangular pro- 

 jection on the other ; the unci are thin triangular plates armed 

 with one large, deeply-cut tooth, well separated from the rest, and 

 live shorter sharp teeth, rather irregular and varying in shape. 

 The incus consists of a long, narrow but deep fulcrum, and very 

 thin, broadly triangular rami. The figs. 10, 10a, and 106 will give 

 ;i better idea of the shape and position of these organs than any 

 amount of description. 



The cesophagus, arising from the dorsal side of the mastax, is 

 of moderate length, and opens in a thick-walled stomach of usual 



