2 TROCHOMOKPHID.E. 



I append anatomical details copied from Pilsbiy's work 

 referred to : — 



" Animal : Toot long and rather narrow; sole flat, with no trace 

 of lo7igitudinal division ; parapodial groove distinct, bounding a 

 wide vertically grooved foot margin, and having a shallower 

 groove above it. Tail depressed above, rounded behind, ivithout a 

 mucus gland. Back with several indistinct longitudinal rows of 

 granules ; sides irregularly granular. Shell lappets none ; but 

 mantle having a wide body-lappet on the right and a small one 

 on the left. Lung orifice to the left of the superior angle of 

 aperture. 



" Genitalia simple, the penis moderately long, somewhat twisted, 

 the retractor muscle and vas deferens entering at the apex. 

 Npermatheca on a short duct. Orifice of genitalia near the pedal 

 groove, below and slightly back of the right eye-peduncle. Kight 

 eye-peduncle retracted between branches of genitalia. Kidney 

 long and narrow. 



" In T. castra and T. timorensis the duct of the sperniatheca is 

 very long. In all other features of genitalia, jaw, and teeth they 

 resemble the typical Trochomorphas. The length of this duct 

 may warrant the retention of the section Sivella, Blanf. 



" Jaw arcuate, smooth, with a small median projection, or none. 

 " Eadula : central and lateral teeth having the strong mesocones 

 projecting ivell over the p>osterior borders of their basal plates, and 

 lacking ecto- and entocones. Outer lateral teeth at first sinuated 

 outside, the sinuation increasing to a denticle on the transition 

 teeth, and ascending on the mesocone to form the long hijid cusps of 

 the marginal teeth, which become very oblique. 



" AViegmann has recently dissected a specimen of 



T. planorhis,Ijess. (Weber's Zool. Ergebn. Reise Niederl. Ost- 

 Indien, iii, p. 152, ]b9;3). This species shows the lower portion 

 of the vas deferens to be dilated beyond the axis of the penis, 

 where the retractor muscle is inserted. The vagina is much 

 swollen between the lower end of the uterus and the opening 

 of the spermatheca duct, and at the upper end of this swollen 

 portion there is inside a whitish gland formed of the one-celled 

 club-shaped follicles. This internal vaginal gland has not been 

 noticed in other species. JStoliczka has published the anatomy of 

 T. castra and 'I', timorensis (Jouru. As. Soc. Bengal, xlii), finding 

 these species to have the structure of typical Trocliomorpha except 

 for the very long duct of the spermatheca." {Pilshry.) 



Godwin-Austen investigated the anatomy of T. trilineatus and 

 gives the following details : 



" Animal. — Has no overhanging lobe at the extremity of the 

 foot : the slit of the mucous gland cannot be discerned owing, 

 possibly, to the contracted state of the spirit specimen, though th« 

 wide pallial fringe and the shape of the extremity of the foot 

 point undoubtedly to its presence. The animal is black in colour, 

 with a pale foot beneath, and above the ])allial margin is finely 

 papillate. The jaw has a central projection. The radula lias 



