A". JJUlinys — JV^vf Species of Stncklandmia, 5 



Hrli(H;k moiintitiiis, '>i) tli«« houili sitlc of tlio St. Lawrenoe aboiii 2A0 

 miles tNistcrly tnmx QucbfA;. I Lave novo; soon a spociuitn I'lom 

 any othor part >)f Aiuoruja, 



Stricklnndtrtia Salti'.rti. h\> u. — Plato IV. Figfi. 2-2i. 



Sptc. <:/inr. — Shell iMUHviTsely oval ; width i^ruiiUT than the length; Hitles and 

 fiMiit Uf>iiiil!y riiuiuh'd, hut often wiHi un olmcure liiiwuit'crm extension Ilinjre-line 

 nearly us wide us the shell, striiiKht and a little Hlopiiig on eiieh side of the beaks. 

 Hoth valvijs ire gently and niiifornily convex. The ventral valve lia» often a harely 

 jKTct ptilile mesial «''■■'; the nmho small, the lank not ineurvfd ; the area very 

 narrow, seanely • 'ng the thicknesh of the shell , the foramen (as (*een in 



detuclied frajirniMV .;.'ular and ojieu to the he-ulx ; tin sraull ehaniher ot the beak 



almost exadly hk .,it of S. Iwvis, and <S'. mU riHamerus, as ligiired by Sowerby, 

 M'Coy, and l.tii^idson. The dorsal valve "nmetinn's giv.s indieations eif an ohseure 

 nii'siai fold; but, in ge'neval, it i" uniformly convex. 1 have not seiai the area of 

 this valve, but it ninnt be. linear the're is no umbo, [surface with several eoneentric 

 imbrications of growth, and with very niirrow obscure ril.'s, three or four in two 

 lines, (.mving uutwaids to the side.s, and some of them upwards to the hinge-liiie. 

 These are also erossed by iiin eoiicenfrict wrinkit--. \V'hen tht; specinujns arc 

 fjiffhtly (Afiiliat«'d all the snrt'aee-chiiraetirs disappear. 



Length iif tin- largest 8])eeime'n .■'een, twenty-tive lirniS ; grcat(st. width of the 

 san)e, at about the nuii-length, thirty-three liuo.-^. Some of tho specimens indicate a 

 greater ]»roportioaa! length, 



O/.'s.- 'I'liOTc; is no either known ^p(■cie8 witli wliicli tliiH noed bt) 

 coniparod ex(.o]it 8. Itv.viK, Sow(,'r})y, as described by M'Coy, iinde-r 

 the narno oi' Pi'ntam*rm microc.iirturns {\\r\t. V'A. Foss., ji. 210). 

 The width of that species, in pro|.ortion to tlio hingth, is stated to 

 bo an iit'ty-Kve is to one buiuhod. whereas in this it is, on an average, 

 about (;iglity to one huinlred. Tliis great (b'ttVrenee in pr(»])cirtions 

 rarely occurs in tho same species. ]Vloss)',s. Davidson and Salter are 

 of opinion tliat M'fJoy's P. microcamcrus is identical with S. lm». 

 Be that as it may, tlic figuto of S. hjufh, given by SoAve.rby in 

 •' Sil. Hyst.," pi. xxi. tig. L'l, seems to be distinct from S. Aws. and 

 also frnju S. Salterii. He says (Op cit., p. 038j, •' Somieirciilar, 

 compressed, smooth , a slight cleviition along tho middle , beaks 

 rather promin(;nt, the area bet\voet\ thetn nairow, with parallel 

 edges. .Length, eight lines ; width, twice as nmcli." Th.3 words 

 " elevation along tho middle " could only apply to the dorsal valves 

 of S. lens and S. /(erin, in neither of wdiich can the dorsal foramen 

 be seen, when viewed in the position in whicli Sowerliy's specimen 

 is drawn, as it is in the iignro cited TIukS ligure, however, always 

 appears to me to exhibit a sinus rather tluin a fcdd, in Avhich case it 

 would be a A'entral vtdve;. .liidging from Mr. Davidsons figures, I 

 should say that the upper part vf the vetitral valve o( S. fi'n,^ must 

 be of a very di.GFerent tVtrm from that <.»f the specimen represented 

 by Sowerby. 



Position and hcaiiiij. — Slricl'Iandinia SaiU'rii occurs at Heath 

 Point and Cormorant Point, Anticosti, in the Anticosti group, 

 division 3== to the Upper Llande>verv rocks. 



Besides these two species tli<ire is a form with the ribs straight, 

 which may possibly be a vari«!ty of »S. Davidmnii. It occurs at 

 Anticosti in the same beds with the others. 



In describing Stricklandinia 1 unfortunately stated that " 'Hiis 



