152 THE VOYAGE OF H.M.S. CHALLENGER. 



the two kiucls of radiating strias, tliu one visiljle in certain positions to the naked ej'e, tlie 

 other microscopic. I know of but one or two other species so finely sculptured. 



Dosinia anus, Philippi, and Dosinia suhrosea, Gray, both likewise from New Zealand, 

 are more strongly Urate, the former being the most coarsely scul]iturod of all. In Dosinia 

 anus the pallial sinus points below or at the lower end of the anterior scar, in Dosinia 

 suhrosea at the middle of the scar, and in Dosinia lamhata it is directed still more 

 upward. The great difference in the sculpture at once distinguishes Philippi's species 

 from the present, and Dosinia suhrosea, besides being rather more strongly lirate, is 

 different in form. It is a broader shell witli the beaks less prominent above, and has a 

 more distinct posterior dorsal angle. All three species have a microscopic radiating 

 sculpture, l)ut that oi Dosinia lamhata is the finest. 



Dosinia hist rid (Gmelin), var. 



Dosinia histvio (Gmeliu), Eomor, Jlonog. Dosinia, p. 33, pi. vi. figs. 2, 3. 



Habitat. — Station 187, near Cape York, in 6 fathoms; also Flinders Passage, in 7 

 fathoms ; and at Station 189, Arafura Sea, in 25 to 29 fathoms. 



The specimens from the first of the above localities are entirely white, and very closely 

 and delicately concentrically lirate. They are perhaps a trifle higher in proportion to the 

 length than is usual. The following are the measurements of two specimens. 



Length 33^ mm., height 33-i^, diameter 19. 



Length 30 mm., height 30, diameter 18. 



This species has received several names from various authors. It is the J^entis 

 australis of Quoy and Gaimard, the Artemis variegata of Reeve, Artemis Virata and 

 lenticularis of Sowerby, and jjerhaps the Artemis scabra of Philippi. 



The specimens from Station 187 and Flinders Passage resemble the variety Artemis 

 lirata. 



Dosinia mira, n. .sp. (PI. I. figs. 3-3t'). 



Testa alba, cretacea, tenuis, parum insequilateralis, trausversim rotunde ovata, medio- 

 criter convexa, concentrice dense lirata et lamellata, lamellis tenuissimis, angustis, 

 irregulariter plus minusve interruptis vel abruptis, interstitiis radiatim substriatis. 

 Lunula cordata, modice profunda, in medio prominens, tenuiter lamellato-lirata. L^m- 

 bones valde incurvati, mediocriter prominentes, paulo ante medium siti, apicibis nitidis, 

 striatis. Margo dorsi anterior valde obliquus, vi.x curvatus, posticus rectiuseulus, minus 

 descendens. Ventris margo late regulariter(|ue rotundatus. Area dorsalis inconspicua, 

 angusta, hand excavata, in medio prominens, utrinque sulco baud })rofundo, inconspicuo 



