160 
MOLLUSCA. 
nutritive part forming the endoderm. The definite mouth is formed by 
an invagination of the ectoderm. The preconchylian invagination is not 
so strongly marked as that observed by the author in Dendronotus and 
Goniodoris. The first shell is of a nautiloid form and presents two 
dorsal and two lateral keels ; inside of it a second shell is formed, more 
simple, resembling that of Carinaria, and united to the first at the 
aperture by a very thin membrane. 
Different aspects of this species are given by W. 0. Macintosh, Mar. 
Invertebr. of St. Andrews, pi. iii. figs. 2-10. 
Marsenia gemma and isdbellina^ spp. nn., figured, but not described, 
by R. Bergh, in Semper’s Reis. Archip. Phil. ii. pi. xli. figs. 7 & 8, 
Philippine Islands. 
Chelyonotus semperi, sp. n., figured, but not described, id. 1. c. pi. xli. 
fig. , 9, Philippine Islands. 
OoNIDJE. 
Conus. The monograph of this genus in Kuster’s Conchylien Cabinet 
has been finished by H. 0. Weinkauff [swprd, p. 132] ; it contains the 
descriptions and coloured figures of 401 species, with valuable critical 
remarks, an alphabetical index, and synonyms. 
Conus. The species living in the Red Sea are enumerated from per- 
sonal observation, with full synonymy. C. schech (Jickeli) and varieties 
of textilis (L.), acuminatus (Ilwass), and erytJirceensis (Beck) being figured, 
by 0. Jickeli, JB. mal. Ges. ii. pp. 43-71, pi. i. figs. 1-8. 
Conus ceylonensis (Brug.) and pusillus (Chemn.). The animals as well 
as the shells are distinct ; G. & H. Nevill, J. A. S. B. (n.s.) xliv. pt. 2, p. 83. 
Conus pseudomarmoreus, G. P. Deshayes, J. de Conch, xxiii. p. 223, 
pi. ix. fig. 4, locality unknown, very near C. marmoreus (L.), but spirally 
grooved ; C. coxeni, Brazier, P. Z. S. 1875, p. 34, Moreton Bay, Aus- 
tralia ; C. gracilis and unilineatus, J. Sowerby, tom. cit. pp. 125 & 126, 
pi. xxiv. figs. 6 & 5, locality unknown ; C. tasmanicuSf J. E. Tenison 
Woods, P. R. Soc. Tasm. 1875 (sep. copy), p. 7, Tasmania ; C. traversi- 
anus, Edg. Smith, Q. J. Conch., i. p. 107, woodcut, locality unknown : 
spp. nn. 
Dihaphus philippi (Crosse) = edentulus (Swains., sp.) and IcehhecTci^ 
sp. n., H. C. Weinkauflc, in Kuster’s Conch. Cab. pt. 258, pp. 1-3, pi. a, 
figs. 1-3, the locality of the latter unknown. The author thinks that 
possibly the typical species may be a deformed Conus mitratus, and the 
second the young state of Mauritia barclayi (A. Ad.). 
Pleueotomid.®. 
Pleurotoma. H. C. Weinkaupf has commenced a monograph of this 
genus in Kuster’s Conch. Cab. pt 238 ; in the introduction, he gives a 
systematic arrangement of the family, distinguishing the following 
genera: — Pleurotoma^ Drillia, Conopleura^ Clavqtula, Lachesis^ Clionellaj 
Raphitoma^ Borsonia, Halia, and Taranis^ some of them with sub- 
divisions. 49 species of Pleurotoma proper and Drillia are described 
and figured, pp. 9-48, and pis. i.-x., including P. jickelii^ sp. n., p. 20, 
