514 G. C. Crick — Locality of Nautilus tnmcatus, Shij. 

 Terebra (Subula) maculata, Linn^us. (PL XX, Fig. 7.) 



Buccinum macula ti{ in, Linnffiiis : Systema Naturje, lOtli ed. (1758), p. 741. 

 Distribution.— Gulf of Suez, Gulf of Akaba, Society Islands, 

 Moluccas, Australia (Issel, Tryon). Coll. Geol. Surv. Egypt: 

 lower coral reef nortb of Eas Mobamed or Gbazlandi Bay (No. 

 3,502, Box No. 41 Z). 



{To be concluded in our next Number.) 



V. — Note on the Hobizon and Locality of Sowerby's Type- 

 Specimen OF Nautilus truncatus. 

 By G. C. Crick, F.G.S., of the British Museum (Natural History). 

 l^AUTILUS TBUNGATUS was described and figured by 

 J. Sowerby in the "Mineral Concbology," vol. ii, p. 49, 

 pi. cxxiii, April, 1816, bis description and remarks being as 

 follows : — 



"Spec. char. Tbick, flatted, plain, umbilicate; back flat, mouth 

 elongated, four-angled : siphuncle nearest to the inner margin of 

 the septum. 



" Syn. Lister, 1048. 



"Thickness rather less than half the diameter; the sides are 

 rather conical and even. Mouth above half the diameter of the 

 shell, long, narrowest towards the back, siphuncle oval. Septa very 

 numerous, not recurved towards the umbilicus. 



" A fine specimen of this species is figured by Lister, measuring 

 ten inches in the longest diameter; no doubt, when perfect it is 

 sometimes much larger : mine is eight inches, I figure a part of it, 

 as sufficient ; the remainder is a broken continuation of it. I have 

 never seen the last chamber. This is composed of a mixture of 

 dark lias limestone and pyrites, found at Keynsham, S.E. of 

 Bristol. It is also said to be found in the blue lias of Bath, etc. 

 Lister does not say where his specimen was found ; his figure shows 

 about three whorls, mine did not expose them ; possibly when the 

 shell is removed the whorls may be uncovered. Mine has fragments 

 of the shell of considerable thickness about it, indicating that it was 

 smooth when perfect." 



Sowerby's type-specimen, of which only a portion was figured, 

 is now in the British Museum collection (register No. 44,117a). 

 In his remarks, Sowerby says he had never seen the last chamber, 

 by which statement he must mean that he had not seen the loJiole of 

 the last chamber, for half of the unfigured portion of the specimen 

 is an internal cast of a portion of the body-chamber, the rest being 

 composed of internal casts of the last four loculi ^ or camer^e. The 

 umbilicus was evidently closed.- 



In his "Supplemental Index" (p. 251) to vol. ii of Sowerby's 

 ■"Mineral Concbology," Farey gives for this species the localities 

 " Bath W, and Keynsham." 



^ Usually called ' air-chambers.' 



* The specimen figured by Lister evidently had an open umbilicus, and, judging 

 by the figure, it was, I believe, from the Calcareous grit, and is referable to J. de C. 

 Sowerby's Nautilus hexagonus (Mm. Conch., vol. vi, 1826, p. 55, pi. dxxix, fig. 2). 



