R. J. L, GUPPY ON THE MIOCENE FOSSILS OF HAITI. 529 



Gabb as C. nucleus. I think it may be regarded as intermediate 

 between those two species ; and it presents, I think, some characters 

 which, combined with its distance in time and space from its nearest 

 congeners, may warrant a provisional specific name : — 



Oval- elongate, rostrated at both ends, superiorly covered with 

 large shining tubercles, which are almost circular upon, the back, 

 but become elongate and have a tendency to run into ribs near the 

 thickened and regularly grooved lip, whose dentations are continuous 

 with the ribs on the outside. A dorsal groove separates the back 

 into two nearly equal halves. 



The tubercles are larger than those of C. nucleus. 



88. Calliostoma conicum, Gabb, 7. c. p. 243. s 



I possess a shell from the Miocene of Jamaica which may belong 

 to this species. It differs from Gabb's description in having beaded 

 ribs, of which the one on the angle of the whorls is largest. The 

 shells described by me from the Pliocene of Trinidad under the 

 names Troclius decipiens and plicomplialus are nearly allied. 



A critical examination of the species of this section of Troclius 

 found in the West-Indian area is much needed. They are very rare ; 

 but a few are occasionally found. The present shell resembles some 

 of the European Miocene forms, e. g. T. laureatus, Mayer, and 

 T. Pauluccice, Mayer. 



I do not recognize the Margarita tricarinata nor the Adeorbis 

 carinata among the Haitian fossils. It has occurred to me that one 

 or both of them belong to the species described by me as Cyclo- 

 strema bicarinatum ; but I can speak with no certainty on this point. 



89. Phortts delectus, n. sp. (Plate XXVIII. fig. 10.) 



Shell conical, umbilicate, whorls sharply angulated below, form- 

 ing a very concave base, and bearing on the periphery a keel carry- 

 ing obtuse tubercles. Upper surface covered with close undulated 

 ridges, occasionally dichotomous or anastomosing, and running in a 

 more or less spiral direction, but directed rather towards the outer 

 margin. Base concave, covered with spiral rows of small grains. 



I do not feel sure that this is the shell indicated by Prof. Gabb 

 under the name of Pliorus agglutinans, Lam. It is certainly very 

 different from the Eocene P. agglutinans, and it is apparently suffi- 

 ciently distinct from the living Pliorus of the West Indies (whose 

 name is properly P. concliyliopliorus) to deserve a specific appella- 

 tion. 



90. Teredo fistula, Lea, ?=Ktjphus incrassatus, Gabb. 



91. Corbttla vlmtnea, Guppy, G. J. vol. xxii. p. 293, pi. xviii. 

 fig. 11. 



Bothrocorbula viminea, Gabb, Proc. Acad. N". S. Phil. 1872, p. 274, 

 pi. x. fig. 3. 



The new genus Bothrocorbula of Gabb is founded upon this species, 

 and may possiblv pass as a subgenus or section. 



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