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Stat. 51. Madura-bay. 69 — 91 M. Fine, grey sand; coarse sand with shells and stones, i Spec. 

 Stat. 123. North-bay, Biaru-island. 36 — 27 M. Stone and Lithothamnion-bottom. i Spec. 

 Stat. 315. East of Sailus-Besar, Paternoster-islands. Up to 36 M. Coral and Lithothamnion. I Spec. 



The specimen from Stat. 315 is young, but agrees sufficiently with the other specimens 

 to be identified. The long and slender radula, has the teeth in about 108 transverse rows. 

 The rhachidian tooth (R) has a subquadrangular body with the sides strongly excavated in the 

 posterior half, posterior margin much shorter than the anterior one ; the cusp has 5 denticles, 

 of which the median one is the largest; the lateral tooth (i) has an oblong shape with a large 

 denticle on the proximal side of the cusp and three smaller distal ones; the uncini (U) are 



a 



hooked, slender, the first one with a small denticle on the proximal side, only visible by the 

 transparency of the teeth. The construction of the radula, proves that Dall, in his paper (An 

 historical and systematic review of the Frog-shells and Tritons; Smiths, Miscell. Coll. Vol. 47, 1905, 

 p. 114 — 144) is right in calling the species united as Gyrineum^ the nearest allies of Aquilhis. 

 He mentions only the radula of Ranella (Apollon) argus Lam., described by Troschel, (Gebiss 

 der Schnecken, Vol. I, pi. 20, fig. 11) which is conchologically a somewhat pecuhar species; 

 really the radula now under consideration, shows more resemblance to those of Tritonium 

 femorata Lin. (1. c. fig. 2) and of T. pileare Rve (1. c. fig. 3), the most typical difference being 

 the narrow posterior basal margin. 



4. Gyrinezcm pusilhun Broderip. 



Broderip. Proc. Zool. Soc. Lond. 1832, p. 194. 



Reeve. Conch. Ic. Vol. II, Ranella, fig. 44. 



Tryon. Man. of Conch. Vol. Ill, p. 44, PL 24, fig. 56, 57. 



Stat. 7. Near reef of Batjulmati (Java). 15 M. Coral and stones. [ Spec. 



Stat. 33. Bay of Pidjot, Lombok. 22 M. Mud, coral and coralsand. I Spec. 



Stat. 60. Haingsisi, Samau-island. Lithothamnion-bank. i Spec. 



Stat. 144. North of Salomakiee-(Damar)-island. 45 M. Coral bottom and Lithothamnion. i Spec. 



Stat. 154. o°7'.2N., I30°25'.5E. Halmahera Sea. 83 M. Grey muddy sand, shells and Litho- 

 thamnion. I Spec. 



Stat. 162. Between Loslos and Broken-islands. W. coast of Salawatti. 18 M. Coarse and fine 

 sand, with clay and shells. I Spec. 



Stat. 164. i°42.5 S., i30°47'.5 E. Halmahera Sea. 32 M. Sand, small stones and shells. 2 Spec. 



Stat. 204. Northern entrance of Buton-strait. 75 — 94 M. Sand with dead shells. I Spec. 



Stat. 260. Kei-islands. 90 M. Sand, coral and shells, i Spec. 



Stat. 313. East of Dangar Besar, Saleh-bay. Up to 36 M. Sand, coral and mud. i Spec. 



Stat. 315. East of Sailus Besar, Paternoster-islands. Up to 36 M. Coral and Lithothamnion. I Spec. 



This species is very variable in colour and also in sculpture; the specimen from Stat. 144 

 is yellow, and has the spiral lirae scarcely developed on the lower whorls ; if this character be 

 not individual, it might give right to a varietal name. 



5. Gyrineiim (Biplex) perca Perry (PI. X, fig. i, var. amleaia n. var.) 



Perry. Conch. PI. 4, fig. 5. 



Kiener. Coq. Viv. Vol. VI, Ranella, p. 8, PI. 6, fig. I (pulchra). 



Reeve. Conch. Ic. Vol. II, Ranella, fig. 47 (pulchra). 



Tryon. Man. of Conch. Vol. Ill, p. 43, PI. 23, fig. 51 [pulchra). 



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