﻿M Y A. 



Species 5. (Fig. «, l>. Mus. Brit.) 

 Mya Piiiliitin.\ki:m. Mya leM,'i tenui, alhd, inJlalA, , 

 incBqiiUattTali, vix aiquivalvi ; latere anlico l<Bvi, 

 ventricosissimo, margine dorsali declivi, margine 

 ventrali injlato : latere poslico brevi, striata, sub- , 

 coinpresso, postice ctmeafn, subangulato, rHx trun- 

 cato, margine dorsali declivi, inargine ventrali 

 snrsum acclici, umbonibus rotundis, retrorsis. I 



The Philippine Mya. Shell thin, white, indatcd, in- 

 equilateral, scarcely cquivalve ; anterior side j 

 smooth, very ventricose, dorsal marnin sloped, 

 ventral margin much inflated ; jiosterior side 

 short, striated, a little compressed, posteriorly 

 cuneate slightly angular, hardly truncated ; dorsal 

 margin sloped downwards, ventral margin sloped 

 upwards ; umboes rounded, leaning backwards. 



A. Adams. MS. Brit. Mus. 



Hab. Bay of Manilla. 



Belonging to the group known as Cn/ptomr/a, and 



like several other species, liaving one half of its surface 



Striated ; the other smooth. 



Species 6. (Fig. a, b. Mus. Brit.) 

 Mya semistriata. Mya elongato-ovatd, tenui, alba, 

 latere antico inflalo, la:vigato ; latere postico, 

 usque ad medium tenuiter, postice valde striata, ad 

 terminum anguslato. angulata, past anguhnn, trun- 

 cato, leevi. 



The iialf-stri.\ted Mya. Shell elongated, oval, thin, 

 white, anterior side inflated, smooth; posterior 

 side finely striated as far as the middle, strongly 

 behind, narrow at the end, angular, truncated 

 behind the angle, smooth. 



Hanley. Proc. Zool. Soc. ISoO, p. SO. 



One of the Cri/plom)/a group described by Mr. 

 [lanloy from a single valve in the collection of the 

 late Mr. Cuming. 



Species 7. (Mus. Brit.) 

 Mya i-n.ECiSA. Mya testa oblongo-subquadratd, brevi 

 altd, concentrie'e irregulariter rugatd, antice in- 

 flatd. latd ; postice subangustatd : latere postico 

 brevi, late truncuto, hianti, margine elevato. 



The siioKTKNEii ISIya. Shell oblong-subquadrate, short, 

 elevated, concentrically irregularly wrinkled, in- 

 flated in front, broad; posteriorly rather angular ; 

 posterior side short, liroadly truncated, gaping, 

 margin raised. 



Gould. United States K.xploring Kxpedition. 



Ffab. Sitcha. 



Although this sliell is broader and sh.jrter than the 



British Mya tnincata is generally found, its distinctness 



from that species is matter of some doubt. 



Species fS. (Fig. a. t>, Mus. Sowerby.) 

 Mya cancellata. ifya tesld elongatd, crassiusciihl, 

 albidd riigis cotin ntricis nmnerosis, minute undulatis, 

 tl striis vdiliaiitihis dccussatd ; latere postico brevi, 

 cuncato, ad Irrmiiiirm. tnincato, circtdariter hiant . 

 latere posllm injlato, tMique praducto, ad termi- 

 num rotundato. 

 The cancellated Mya. Shell elongated, rather thick, 

 whitish; decussated with numerous minutely im- 

 dtilated concentric Avrinkles and radiating stria, 

 posterior side short, cuneate, truncated and roundly 

 gaping at the end; posterior side inflated, 

 obliquely produced, rounded at the end. 

 CoNi'.AD. Annals of Natural Science of the Academy oi 



Philadelpliia. 

 Hab. California. 



April, 187 



