﻿DALL] REVIEW OF FROG-SHELLS AND TRITONS I ~3 



first, Monoplex contains five species with a single varix on the body, 

 of which two may be identical with Triton retusum and T. clavator 

 Lamarck, one is allied to T. olearium (L.) Reeve, and was selected 

 as type by Gray, 1847; one > cornutus Perry, is unidentifiable, cer- 

 tainly not exaratum Reeve, to which it has been referred. The last 

 species is Tudicla spirilla Linne. Perry's second group was called 

 by him Biplex, and contains a mixture of species of Bufonaria and 

 Gyrineum. Fischer following Gray (1847) has retained the name- 

 in a sectional sense for the B. perca Perry, a remarkably compressed 

 and crested form from Japan, better known as Ranella pulchra Gray. 

 His third group, Septa, is also a mixture of species belonging to 

 Cymatium Bolten, and Triton Montfort, and, since the latter had 

 up to this time no valid name, the writer in bis Report on the 

 Mollusca of Porto Rico, adopted it for the group of which Triton 

 tritonis Linne has usually been regarded as the type. Perry inci- 

 dentally mentions S. tritonis but his largest and most conspicuous 

 species, among those he figures, is Septa rubicunda Perry ( -f Triton 

 nodiferum Lamarck) which may be accepted as the type. 



Cuvier in 1817, in the Regne Animal, adopted Montfort's sub- 

 divisions, but Schumacher, in the same year, proposed an entirely 

 new series. Distorta Schumacher is identical with Distortrix Link. 

 Lampusia a Schumacher, with Murex pilearis Linne, as type. Lam- 

 pusia (3, with Murex tritonis Linne, taken together are the equiva- 

 lent of Septa Perry. A group not noticed by previous authors is 

 judiciously separated by Schumacher under the name of Colubraria 

 with the Buccinum maculosuui of Chemnitz as type. Lampas Schu- 

 macher, but not of the Museum Calonnianum, belongs with the 

 Ranellas and is identical with Schumacher's Bufonaria /?. Gyrina 

 Schumacher is founded on Ranella gigantea Lamarck, and might 

 be retained if not thought to be preoccupied by Gyrinus Linne. 

 Ranularia a Schumacher, is founded on Purpura gutturnium Mar- 

 tini (= Triton clavator Lamarck) while Ranularia f3 is based on 

 a better figure of the same species. 



Lamarck, in 1822, included under the name Triton almost all the 

 forms above referred to as well as two species of Tritonidea. Blain- 

 ville includes Montfort's groups as subgenera of Triton, unhap- 

 pily adding to them Struthiolaria. Giiiuia {lanceolata Menke) of 

 Bivona, 1838, is a subgenus of Colubraria, and Luterium Herr- 

 mannsen, 1846, a proposed emendation of Lotoriuni due to a mis- 

 taken etvmology. In 1848 Gistel proposed to substitute Charonia 

 for the preoccupied Tritonium of Cuvier, and Xyctilochus for Triton, 

 not being aware, apparently, that the two are synonymous. The 



