142 LAND AND FRESHWATER 



Fig. 2 h. The anterior end of the dart, X 4. 



2 i. Posterior bend of male organ with retractor-muscle attachment, X 2. 



B, Buccal mass ; Bcdm, central dorsal muscle of buccal mass ; Brdm, riglit 

 dorsal muscle of same ; Bid in, left ditto ; B + ^e, lefteye-tent:icle united with 

 that of buccal mass ; Byj, pedal and buccal mass ; D, amatorial organ ; hd, 

 liermaphrodite-duot ; Al.yld, albumen-gland ; /, iutes;ine ; a, anus ; m, mouth ; 

 Sal.gld, salivary gland ; Pul.cav, pulmonary cavity ; ;•, renal organ ; P + rE, 

 right eye-tentacle united with that of the male organ ; I, liver. 



EXPLANATION OF PLATE LXXXIX. 



Ausfenia gigas, small var. Khasi Hills. 



Fig. I. Generative organs, side view, different parts in relative position (=fig. 1, 

 pi. XXV. P. Z. S. 1880), X 2. 



2. Ditto, viewed from above ( = %. 2, pi. xxv. P. Z. S. 1880), X 2. 



3. Ditto, removed from the animal ( = fig. 3, pi. xxv. P. Z. S. 1880). X 2. 



4. Oesophagus, mucous gland, and anterior loop of the vas deferens 



showing position of ( = fig. 4, pi. xxv. P. Z. S. 1880). 



5. The amatorial organ cut open, exposing the muscular dart or rod, 



much enlarged (=:flg. 7, pi. xxvi. P. Z. S. 1880). 



^/.^f/f^, albumen -gland; Bcdm, central dorsal muscle of buccal mass; (Brd}m, 

 m{Bld), right and left dorsal muscle of same ; D, dart-sac or amatorial 

 organ; rniD, retractor muscle of same; IW, left eye-tentacle; H.ap, 

 • hermaphrodite aperture; rmP, retractor muscle of penis or male organ ; 

 Pa, anterior end of same; Pc, posterior end of same; Pd, junction of 

 vas deferens ; K, cfficnra calciferum or kalk-sac ; 8p, spermatheca ; Sal.gld, 

 salivary gland ; Sal.dt, salivai-y duct : a and d, minor ducts to the 

 stomach ; st, stomach ; i, intestine ; vd, vas deferens ; vag, vagina ; cv, 

 oviduct; mu.gd, mucous gland ; m, muscular band. 



EXPLANATION OF PLATE XC. 



For a description of the anatomy, see Vol. I. pp. 229-232. 



Audenia gigas, Bs. Teria Ghat. 



Fig. 1. The male organ, showing the position hi situ of the spermatopiiore 



in its passage outwards ( = fig. 2, pi. xxvi. P. Z. S. 1880), X 3. 



2. Ditto, showing capsule filled with spermatic coil ( = fig. 3, pi. 



P. Z. S. 1880), X 4. 



3. Ditto, spermatophores in the speriuatheca, X 4. 



Ausfenia gigas, small var. Khasi. 



XXVI 



Fig. 4. Broken portion of spermatophore, much enlarged ( = fig- 6, pi. xxiv. 



P. Z. S. 1880). 



Austenia Imtleri, G.-A. Naga Hills. 



Fig. f). Shell r=^fig. 9, pi. xxiv. P. Z. S. 1880), nat. size. 



6. Shell-lobes and mantle-lobes ( = %. 1, pi. xxvi. P. Z. S. 1880). 



7. 7 a. Teeth of radula ( = fig. 10, pi. xxvii. P. Z. S. 1880), X 340. 



8. Jaw ( = fig. 9, pi. xxvii. P. Z. S. 1880). X 8. 



9. Generative organs ( = fig. 8, pi. xxvi. P. Z. S. 1880), nat. size. 



10. Gervicorn spines of the spermatophore ( = fig. a, pi. xxvi. P. Z. S. 



1880), X 20. 



r;;iP, retractor muscle of the male organ ; vd, vas deferens ; sp, spermatheca 

 (portion of the sac) ; a, a', anterior end of male organ ; h, base of capsule of 

 spermatophore; c, junction of retractor muscle; d, junction of vas 

 deferens ; e, end of kalk-sac ; f.ov, part of free oviduct ; rsl, Isl, Idl, right 

 and left shell and dorsal lobes respectively. 



