the rest) upon the dorsal or upper triangle. The great buhhlc-likc 

 laterally incoiled scales seem disposed to encroach upon the compara- 

 tively narrow intervals of the ril>-.. The nacre 18 dusky. 



Pinna Gouldii. P. testa late et obtuse cuneiformi, subventri 

 carina centralis expert e, fulva, purpureo-vinoso ant ice nebulosa et 

 postice (in castas) radiata ; costis (in exempli* adult i/) paucis, 

 depressis, remotis, angustis, postice subexoletis et squamis fon- 



giusculis subeg/indraceis puree armatis : area ventrali la/ii/sci/la 

 in cxemplis adultis subhevigata : margine ventrali sinttOSO, et mar- 

 yini dorsali retuso vel subrecto subtequali : extremitate postica 

 pendula, rotundata, haud obliqua. 

 Long. 3h, lat. 6± poll. 



Hab. "Amboyna ' (in museo Cumingiano). 

 This beautifully painted shell approaches vexUlum in general 

 aspect, and agrees in many respects with the description of senticosa. 

 The hinder extremity of the latter, which is stated to be subinilated, 

 is declared to be oblique, a most important distinction in the genus 

 Pinna. 



Besides some scarcely raised anterior interstitial riblets, there are 

 about five or six armed ribs, whose diminished elevation at the broader 

 extremity renders them more perceptible from their purplish hue 

 than from their projection. 



Pinna assimilis. P. testa cuneiformi, sublata, subventricosa, 



carina; centralis experte, cornea, antice fumoso-jmrpuraseentc pal- 

 lide tincta, squamis fornicatis longis in costus multas angastas 

 subrotundatas subconfertas dense instructa : area ventrali scabra 

 late, sed obsolete, p/icata, hand costata : margine ventrali ualde 

 sinuoso, et margini dorsali subretuso subccquali : extremitate pos- 

 tica tru/ieata, suhjxndula. 



Long, (exempli parvi) 2J, lat. 'i' poll. 



Huh. Portus Essingtonianus. 



Mus. Cuming. 



One of the many species without salient characteristics. It closely 

 approaches both alia and rig'ula. 



'.i. Description of a New Oniscia. By Sylvan us Ban ley. 



(Mollusca, PI. XLII. figs. 0, 10.) 



Oniscia i»onderosa. 0. testa late et obtuse trigona, ponder 080, 

 alba brunneo punctttiata, eodemgue colore (prasertim intra si/tu- 

 ram) sparsim maeulata : sjiira vix totii/s loiu/itudinis sextain par- 

 tem implente, transvershn striata, anfractibus ejus perbrevibus, 



postice suberenato-margiiiatis. antice erassr nodostS : arm infra- 



euturali subiate concave subanyulnta : au/ractu ultimo trunsver- 



sim cingu/ato, postice nodis granililius longiludinaliti r nodosa ; 



lingu/is alternis nodulosis, nodmlis smbremoHs . labro crassis- 



