300 R. BuIIen Neicton — Marine Fossils from Mekran Coast. 



in sculpture characters, however, the Mekran specimen may possess 

 more regular striations. 



Dimensions. — Left valve ; umbono-ventral, 50 ; antero-posterior, 

 50; diameter, 10 mm, 



Examples. — There is only one specimen in the collection. 



Gastropoda. 



Neptunea Burrowsi, n.sp. (PI. XVII, Figs. 5-7.) 



Shell turreted and fusiform, with a tricarinate body-whorl, which 

 terminates anteriorly in a narrow straight canal. Upper surface 

 of whorls oblique, slightly excavated, and furnished with rounded 

 bicarinate margins ; lower surface of whorls narrow, vertical, ex- 

 cavated, and unicarinate ; shell structure closely, minutely, and 

 spirally fuuiculate. 



Dimensions. — Height, 37 ; diameter, 23 mm. 



The test of this specimen is encircled throughout with regular 

 narrow cord-like costellte, separated by microscopically narrow 

 sulcations, and crossed by fine and slightly curved striations of 

 growth. There are ten costell?e on the oblique sutural region of 

 the body-whorl, and six on the vertical surface of the penultimate 

 whorl, these being margined above and below by a double row of 

 more prominent ones, whilst the upper oblique region of the same 

 whorl bears about eight costellse. No varices or longitudinal costse 

 are present such as characterize the shells of the Muricidae. There 

 is no doubt that the Mekran shell bears a strong resemblance to 

 some of the carinate forms of Ne^ytunea which Searles Wood long 

 ago described from the English Crag deposits as varieties of Trophon 

 antiquum, Liungeus (see Mon. Pal. Soc, 1848, pi. v, figs, la, Ih), and 

 which show a very similar funiculate shell-structure, i.e., var. 

 j'ugosum. Moreover, the occuri'ence of Neptunea itself, which is more 

 characteristic of boreal than warmer climates, in association with 

 genera that belong essentially to warmer seas as are found in the 

 Pliocene formations of Europe, would tend to prove that the 

 Mekran nodules are of Pliocene age. 



The specimen shows both cast and shell structure, the left of the 

 spire being partially enveloped by a parasitic Polyzoan belonging 

 to the genus Membranipora. The protocouch is unfortunately not 

 preserved. I have named this interesting specimen after my friend 

 Mr. H. W. Burrows, F.G.S., who for many years has studied the 

 Crag fauna, and who is good enough on the present occasion to 

 confirm my generic determination of this shell. 



Examples. — One specimen only in the collection. 



Lampusia cf. AFFiNis, Deshayes. (PI. XVII, Fig. 4.) 



Triton affinis, Deshayes : " Expedition Scientifique de Moree, 1833, vol. iii (Zoologie), 



p. 188, pi. xxii, figs. 23, 24. 

 Triton corrugcdum, Homes: Foss. Moll. Tertiaer-Beckens Wien, 1852, p. 205, 



pi. XX, figs. 1-4 ; non Lamarck. 



There are several natural casts of this shell, all giving dorsal 

 views and appearing to be related to Triton affinis of Deshayes, 



