498 Zoological Society, 



costata ; costis nonnullis dichotomis, squamuUs rotundatis, 

 arcuatis, confertis, ornatis ; latere postico oblique truncato, 

 antico rotundato. 

 Hah. Bass's Straits, deep water. 



This species, found by the Hon. Captain Keppell, differs from the 

 type in the ribs radiating regularly from the apex and not being 

 nodosely wrinkled, but furnished with regular rounded arcuated 

 scaly tubercles. 



3. Crassatella obesa, a. Adams. C. testa tequivalvi, incequi- 

 laterali, crassa, yibbosa, epidermide rufo-fusca sericea obtecta, 

 transverse valde plicata, plicis prominentibus, ad marginem 

 ventralem evanidis ; lunula impressa lanceolata ; latere postico 

 subproducto, angulato, margine truncato; latere antico gibboso, 

 margine rotundato. 



Hob. New Zealand, deep water {Mr. Strange). 



This species somewhat resembles C. lapidea. Reeve, but it is not 

 rayed, nor beaked so strongly posteriorly, and the valves are much 

 more gibbous and very strongly transversely plicate. 



4. Crassatella Cumingii, A. Adams. C. testa cequivalvi, 

 incequilaterali, subtrigonali, epidermide fusca radiatim striata 

 obtecta, transverse eoncentrice valde plicata, plicis crassis, ele- 

 vatis, ad marginem ventralem evanidis; latere antico rotundato, 

 postico subrostruto, margine oblique truncato. 



Hab. Moreton Bay, East Australia, deep water {Mr. Strange). 



This large species is near C pulchra, Reeve, but differs in being 

 more gibbose, less beaked posteriorly, in the plicae being stronger, 

 and in wanting the coloured rays. 



5. Aspergillum Strangei, A. Adams. A. testa cequivalvi, sub- 

 cequilaterali, alba, transversim sulcosa, umbonibus prominulis ; 

 tubo inferne clauso, disco terminali basi adhcerente, ad latera 

 expansiusculo, margine tubulis minimis ornato, postice subca- 

 rinato, producto, tubulis curtis instruct o ; superne elongato, 

 tortuoso, carinis obtusis quatuor longitudinalibus, ornato, mar- 

 gine simplice recto. 



Hab. Seas of Australia {Mr. Strange). 



Two specimens of this curious form were collected, one attached to 

 a stone, and the other to the valve of a Mytilus. They were found 

 at Sydney, in shoal water. The fact of the tube being nothing more 

 than the valves greatly expanded and modified, is well shown in one 

 of the specimens. 



6. Trigonia Strangei, A. Adams. T. testa cequivalvi, ince- 

 quilaterali, stibtrigona, fusca, longitudinaliter valde costata ; 

 costis antice confertis, postice magis distantibus, squamis nodi- 

 formihus, transversis, imbricatis, confertis, ornatis; interstitiis 



transverse crebre striatis ; latere antico rotundato, postico 



oblique subtruncato. 

 Hab. Sydney, deep water {Mr. Strange). 

 This species is larger than T. margaritacea, and somewhat re- 



