In] 

 I. YI:I:I;I I:M }'.. A. Smith. I'l. 1 1. 



Shell small, depn.-d. >li<jhlly carinated in tlic middle; 

 -ray maculated with dull L'reeii. Lad -ral ;uid 



anterior valve sube<|iially reticulated all OT< 'he poste- 



rior valve subceiitral, moderately acute; -irdl.- -,, \n.-d with 



minute BCal66, POSy-gray maculated with dull green. 

 Len-th 15, breadth 8 n. ill. 



C/i/fo;/ ( :l.'hnorl,;to>i) tjcrlntrij'i SMITH, 1'. /. ^. 1891, ]. U<, j,|. 



n:;, i: (;. 



Only a single specimen <>(' this species wa- found ly Major 5 

 Itury. The sculpture re<-alls that of a thinihle. It i a trifle coar-er 

 on the lateral, especially aloni: their posterior margins, than on 

 the central areas. The dirty green spotting is also more notic, 

 on the hinder edges of the valves than elsewhere. (Sin 



I. M vrcii.i.ivRAYi Carpenter, n. sp. Unfigured. 



Shell elongated, small, elevated, the purum sliirlitly acute, valve- 

 heaked ; ashen-hrown or pale ashen, often elegantly painted with 

 lines or angular flames. Entire surface minutely gran n lose ; lateral 

 areas scarcely defined, having radiating wrinkles, not very distinct. 

 Mucro median, little elevated. Interior: posterior valve having 

 12-13, anterior valve 12-11, median valves 1 slit. Teeth subacute ; 

 eaves very conspicuous ; sinus wide, flat, smooth. Girdle cl< 

 covered with delicate, subelongated, strongly lirate scales. 



Length 14, breadth 7 mill.; divergence 110. 



Tristan d'Acunha (Macgillivray, Mus. Cuming, No. 74, 92) ; St. 

 Paul's (Mus. Ginning, No. 7). 



The specimens from the last locality have the teeth acute. 



This shell has the general aspect of Trachydennoti a/t>u.-< hut is 

 longer, not so sharp at the ridge, more highly sculptured, and tin- 

 scales strongly lirate. The pattern varies greatly in the specii 

 It is nearly related to /. OHI'M-H*, and a larger series of individuals 

 may prove them identical (Cpr., MS.) 



I. RETICULATUS Reeve. PI. 20, figs. HI, 17. 



Shell oblong-ovate ; terminal valves and lateral areas of 

 radiately ridged ; central areas rudely and closely reticul;, 

 dull brown ; ligament horny, rouirh. i Heeve.) 



Wei I 



