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



brown spots on the upper surface of the foot and wings, as well as 

 more numerous but smaller white ones. The animal was not observed 

 to swim, but crawled, with the wings folded over the shell." It is 

 probable, however, that it can swim like the Mediterranean species. 



In the preserved specimen the head is retracted into the shell, 

 which is 6.5 mm. long and 4 mm. broad. The tail projects 4 mm. 

 behind the shell. The front wings are 6 mm. long and 2.5 mm. 

 broad; the hinder are somewhat larger, being 8 mm. long and 3 mm. 

 broad. Each of them has four or five lobes and indentations on 

 either side. The shell as it lies on the animal superficially resembles 

 half a bivalve ; it is thin and fragile, but somewhat thicker on the left 

 side, where there is a small concealed spire ; ovate, striate, white, 

 semitransparent, with a transparent epidermis. The aperture is as 

 long as the shell, broad below, but narrower above. The mantle is 

 thin and yellow, with five dark longitudinal stripes, which are visible 

 through the shell and give it the appearance of being itself striped. 



Through the kindness of Mr. E. A. Smith I have also been able to 

 examine two specimens from the British Museum, labelled ^'■Lobiger 

 viridis G. and H. Nevill, Tuticorin, S. India, from E. Thurston, Esq." 

 The shells of both have been removed and the wings and tail broken 

 off. One has also been eviscerated. The carcases are about 20 mm. 

 long, 10 mm. broad, and 14 mm. high. The colour is dirty olive 

 with dark brown lines and spots on the mantle. There are traces of 

 tubercles at the points where the wings are broken off. All three 

 specimens appear to belong to the same species. The measurements 

 given below apply to the largest. 



The foot is not a groove as in Lophocercus, but a flat sole about 

 6 mm, broad, with a fairly ample margin. The rhinophores are 

 grooved and folded, ample, flexible, and somewhat foliaceous. They 

 do not form a continuous veil over the mouth, but are continued in a 

 fold at the side of the head. Under this fold is a brown groove 

 which can have nothing to do with the reproductive system, as it is 

 found on both sides of the head.^ At the sides of the mouth are 

 rudimentary oral tentacles. 



The mantle cavity is much as in Lophocercus^ but opens more 

 decidedly on the right and not in front. The branchia is clear 

 yellow in colour and large, being 15 mm. long and 4 mm. broad. 

 The auricle lies at the side of the branchia, about the middle, not at 

 the end. The kidney appears to consist of tubes in a chamber above 

 the branchiae, and to be much as in Lophocercus, but is less well pre- 

 served than in that genus. I could not find a postbranchial gland 

 like that of Lophocercus. 



I This is perhaps the " Flimmerrinne" figured by v. Jhering for L. philippi in his paper, 

 " Zur Kennlniss der Saccoglossen," N. Acta Leap. • Carol, Acad., vol. 58 <i892) 1893, 



