OF CONCHOLOQY. 21 



figure, but accompanied by the remark that " it differs from D. 

 appendiculata by its greater elevation and reticulated exterior, 

 and from D. Eugenei by its more el.ivated form and alternating 

 stronger and weaker striae " (Laube, loc, cit.) The discrepancies 

 between the figures of Chenu and Morris have been already 

 alluded to ; in default of a figure, the author might at least have 

 afforded an intelligible description ; at present the species can 

 hardly be said to have been established. It is merely referred 

 to by name by Stoliczka. 



Deslongchampsia appendiculata, Desl. 



Patella appendiculata^ Desl., Mem. Soc. Linn, de Norm, vii 



pi. xi, figs. 1, 2. 

 Deslongchampsia appendiculata^ M. and L., Mon. Gt. Oolite 



Moll. p. 94, vol. i. 



D. testa subovata ; costis simplicis, grandis, radiantibus. 



Shell suboval, with large simple radiating costjfi. 



According to Prof. McCoy, the genus was first recognized, but 

 not described, by M. Deslongchamps, who had only seen this 

 species. 



There are a number of fossils which bear a strong resemblance 

 to this genus and to G-adinia^ but they are usually described as 

 Patella, and the external surface, only, figured, so that it is im- 

 possible to decide on their affinities. 



I have in each case, when practicable, copied the author's 

 original description. 



References to Plate 2. 

 Gfadinia reticulata, Sby., Monterey, Cal. 



Fig. 1. Soft parts from above, a, anus, b, opening of the 

 pulmonary cavity, c, vaginal papilla, d, foramen of penis, m, 

 buccal mass, showing the two nervous ganglia, the oesophagus, 

 the adductors and retractor muscles, and the position of the 

 radula. h, heart. /, papilla of the lung, o, ovary. I, liver, 

 indicated by the darker shade, a, m, muscles of attachment to 

 the shell, i, lung, r, renal organ. 



Fig. 2. Ganglia, d, dorsal, v, ventral. 



Fig. 3. Foot stripped of all appendages, showing the mode of 

 growth of the muscles. 



Fig. 4. a, central and six lateral teeth of the radula as in 

 situ, d, 6th lateral, h, 24th lateral. /, abnormal 25th lateral. 

 b, 75th lateral, c, 80th lateral, g, 100th lateral, e, extreme 

 outer laterals. 



