302 JOURNAL OF CONCHOLOGY, VOL. II, NO. ID, APRIL, I906. 



extending over them. The foot is extremely long and narrow, with a 

 translucent white border, which is wider in front ; this border contains 

 a line of blue spots. The animal swims with rapid lateral movements 

 of the tail, and when first caught was thought to be a smiU -fish." 

 Most of the specimens were small and immature, but one much larger 

 than the rest was about 20 mm. long. 



As preserved, it is 17 mm. long ; this includes the tail, which pro- 

 jects as it did in life, but not the head, which is retracted into the 

 shell. The shell is 9.5 mm. long, and 6 mm. broad ; the wings, which 

 only partially cover it at the sides, are 7 mm. long and 2 mm. high. 

 The shell is much as in Akera biillata, with a flat level spire of two 

 or three whorls ; it is semitransparent and dull white, with inconspicu- 

 ous opaque white striae. The general texture is very thin and fragile. 

 Only the spire is hard and solid, and the inner lip is somewhat call- 

 ous. The aperture is as long as the shell, dilated below but narrow 

 above and extending into a deep sinus along the suture. 



Through the kindness of Mr. E. A. Smith, I have also been allowed 

 to examine two specimens from the British Museum, sent by Mr. E. 

 Thurston from the Madras coast. They are labelled Oxynoe delica- 

 /?^/d! Nevill, but I do not think this species can be separated from 

 Lophocercus viridis Pease, which appears to have priority. They are 

 about 30 mm. long (the tail being about 20 mm.), 10 mm. broad at 

 the widest part and 12 mm. high. The colour appears to have been 

 much the same as in the Zanzibar specimens. One specimen is 

 greenish with minute yellow mottlings, the other yellow with greenish 

 mottlings. Both have some deep blue spots, which appear to repre- 

 sent the remains of ocelli, and both have a row of deep blue dots on 

 either side of the foot. The external characters and anatomy of all 

 the specimens seem identical ; where measurements are given they 

 refer to the largest. 



The body is covered with prominences or papillae, as much as 

 I mm. high, which vary in quantity in the different si)ecimens, but are 

 most numerous on the edges of the wings and upper part of the tail. 

 The anterior margin of the foot is thickened, but no furrow is visible. 

 The sole is a deep groove, seemingly adapted for clinging to stalks. 

 The mouth is large and distinct, with no trace of oral tentacles. Tlie 

 rhinophores are about 3 mm. long, grooved and folded, but in all the 

 specimens stiff and tightly rolled up, not free and foliaceous, as in 

 Lohi^^er. The wings are fairly ample (about 8 mm. long and 6.5 mm. 

 high) but do not cover the shell, immediately behind which they are 

 united and continued in a low thin caudal crest. In some specimens 

 there is a flat area behind the point of junction, and the crest does 

 not begin till further back. 



The mantle closely follows the shape of the shell, and rises into a 



