408 
8. Tenacopus (SiL1quaRivs) TROCHLEARIS, n. sp., Morch. 
T. trochlearis, tenuiuscula, umbilico angusto pervio; anfr. 6, 
primis conjunctis, ceteris tangentibus, inferne et superne pla- 
natis, transversim dense rugoso-fissuratis, longitudinaliter ob- 
soletissime striatis et sulcatis, lineis pallide-lavis spiralibus 
ornatis ; apex turbiniformis, fissura nulla. Rima utrinque 
undulato-dentata, dentibus acutiusculis sepe tangentibus. 
Long. 23 cm., diam. ap. 6-7 mm. 
Tirrebourres, Davila, Cat.i. p. 99, t. 4. f. E, non absimilis. 
Siliquaria anguina, Chenu, Ill. pl. 1. f. 15 (quoad formam spire) ; 
Legons, p. 189, f. 604 (copy). 
T. philippii, coll. Cumingii, specimen unicum. 
The specimen described has not the straight last whorl of the 
figure above-mentioned. 
9. TenaGopus (SiL1quaRivus) ENcAusticus, Morch. 
T. crassa, rudis, irregulariter contorta ; anfr. apicis subdisjunctis, 
compressis, medio angulatis (casu?), aperturam versus teretibus, 
transversim profundissime fissis et striatis,“regio umbilicalis 
callo encaustico obtecta. Rima nulla in anfr. primis 3-4, 
deinde utrinque denticulata, unde poris oblongis et rotundis 
sepe confluentibus, aperturam versus simplex. 
Long. ]2cm., diam. ap. 32 m. 
Hab. Ins. Ceylon (£. L. Layard). Specimen unicum in coll. 
Cumingii. 
The pores perhaps more like those of the preceding group, but the 
closed spiral slit shows more affinity to this section. 
10. Tenacopus (Sitiquarivs) rncisus, (Helix) Chemn. 1786. 
Var. a. Spira superne spiraliter excavata. 
Helix incisa, Chemn. Conch. Cab. ix. p. 5, t. 129. f. 1166 ; Gmel. 
3630. no. 238; Dillwyn, 924, p. 85; Wood, Index, t. 34. f. 85 (copy); 
Pfr. Monogr. Helic. 1. p. 426. 
Var. B. Spira superne plana vel convexiuscula. 
Siliquaria senegalensis, Recluz. 
Siliquaria anguina, Chenu, Mlustr. pl. 1. f. 1 1, non absimilis. 
T. crassa, spira trochleari ; anfr. primi conjuncti padolliformes, 
pallide carnei, umbilico angustissimo, anfr. superne conferte 
radiatim unduloso-sulcati, transversim profunde et conferte 
fissi et striati, spiraliter confertissime et obsoletissime striatt. 
Rima aperta utrinque leviter undulato-dentata. 
Long. 123 cm., diam. apert. 4-5 mm. 
Hab. Senegal (coll. cl. Dunkeri). 
Var. y. LINEATA. 
T. candicans ; anfr. inferne lineis spiralibus confertis pallide 
aurantiis ; apice spire prominente, albo. 
Hab. Senegal (Bernardi). 
