574 Lt. -Colonel H* II. Godwin-Austen on 



fairly large free accessory gland {ac.gld). The spermatheca 

 (PI. XIII. figs. 7-9, sp) is an elongate thin sac at the distal 

 end of a thick strong tube. The free oviduct just above the 

 base of the spermatheca is a very dark pigmented globose 

 sac [ot) (ovithcca?), "svith strong smootli \YalU into which tlie 

 oviduct leads. The shaft of tiie penis is bent in S-form, so 

 that if it were extended it would ba of considerable length. 



Radula : central tooth tricuspid, admedians with cusp on 

 outer side, as figured in Ann. & Mag. Nat. Hist., Feb. 1908, 

 pi. viii. fig. 1 d ; laterals are long, beautifully curved and 

 bicuspid ; the last of the marginal teeth show pectination on 

 the outer side. Formula is 



100 . 3 . 12 . 1 . 12 . 3 . 100, or 115 . 1 . 115. 



Jaw (tig. 6) mo lerately concave on the cutting-edge, w^ith 

 a small central projection. 



'I'lie branchial cavity is not extensive ; the pericardium and 

 adjacent renal organ occupy a subcircular area next it, the 

 kidney being short. 



Tiie spermatheca (fig. 9) contained a perfect spermatophore, 

 a beautiful object. It consisted of an elongate capsule, com- 

 mencing with a mass daik and pointed at one end, terminating 

 in a long gradually narrowing ribbon, having spines set on 

 its edge on one side only. The spines generally branching 

 into three, with bitid points. The ribbon becomes very 

 attenuate at the end and for some distance is spineless. 



In the same individual was a spermatophore developing 

 in the flagellum (rig. 10) and portion of the male organ near 

 the junction of the vas deferens. The attenuated portion 

 corresponds to the extreme free end of the flagellum, and the 

 spines are seen in process of forming. The black portion in 

 fig. 10 (PI. XII 1.) represents a hardened mass of spermatozoa. 



The spermatophore of Peltatus previously described 

 (Ann. & Mag. Nat. Hist., Feb. 1908, p. 132) was immature in 

 process of formation ; the fig. 1 h, pi. viii., may be compared 

 with fig. 10, PI. Xlll., of B. p/iadiinus in a similar stage. 



It was interesting thus to tind many characters similar to 

 those of Peltatus aloicola, M. & P. : the principal differences 

 lying in, (a) the ex| ansion of the shell-lobes into large 

 lappets, [h) the great development of the lobe over the mucous 

 gland. lu (rt) we are presented with the similar develop- 

 ment of the animal as regards the mantle as shown in the 

 genus Eaausten'ia of India, sejnirating it from Macrochlamys, 

 with elongate narrow shell-lobe. 



