﻿PTEROPODA.— Plate II. 



ancjustereflexo, lahro longe lyrodudo, valide elcvato, 

 rostrato, rosiro ad iermhmm hilohato ; margine 

 medio coarctato. 

 The long-beaked Hyal^a. Shell brown, or white, 

 suffused with brown towards the aperture ; ven- 

 tral disc tumid, rounded, finely-ridged, apes 

 nan-owly subtruncated, lateral processes winged, 

 trigonal, bidentate ; apertui'C subtrigonal ; inner 

 lip narrowly reflected, outer lip much produced, 

 strongly raised, beaked ; beak two-lobed at the 

 end ; margin strongly contracted in the middle. 

 Lesueue. D'Orbiguy, Voy. Amer. Merid. PI. VI. 



f. 12. 

 Hah. Atlantic Ocean. 



It is with some hesitation that the writer adopts 

 D'Orbigny's distinction between this and the preced- 

 ing species. The rostrum seems to be more distinctly 

 contracted at the base, and more suddenly upturned 

 in H. loiigirostris than in H. limbata, while the lateral 

 ate are more spread and acuminately produced in the 

 latter species, giving the shell altogether a more 

 triangular appearance. 



Species 13. (Fig. a, h, Mus. ? Copied.) 



HYAL.BA L^viGATA. Hija. tesid discoided, compressd, 

 miriutd, alba ; processihis lateralibus cimeatis, ap ice 



1 producto, acute uncinato ; aperturd. ad ^woces.s-?**- 



continuatd, labiis subcequalibiis. 

 I The smooth Htalj:a. Shell discoidal, ct)mpressed, 

 minute, white ; lateral processes cornered, apex 

 I produced, sharply hooked ; aperture continned 



to the processes, lips nearly equal. 

 D'Orbignt. Voy. Amer. Merid. PI. VII. f. 1-5-19. 



Hah. ■ ? 



I A flat white species of HyahnaQ) very simple in 



Species 14. (Fig. a, I, Mus. Brit.) 



Hyal.ea quadridentata. Hya. testa succined, oh- 

 hngd, twmidd, postich svhanijnftntd, processibus 

 lateralibus acute unidentatix, n^urr pnidacto, an- 

 gtisto, ad ierminum rotidiJa, otrimpie prope 

 termimim unidentato, aperturd angustd, semi- 

 lunaris margine simpliei, refiexo. 



The four-toothed Htal^a. Shell amber, oblong, 

 tumid, posteriorly rather narrowed, latei-al pro- 

 cesses sharply unidentate, apex produced, 

 narrow ; rounded at the end, narrow, with a 

 tooth at each side near the end ; aperture nar- 

 row, semilunar, margin simple, reflected. 



Lesueuk. D'Orbigny, Voy. Amer. Merid. PI. V. f. 

 11-15. 



Hah. ? 



