72 On some new Shells from Kerguelen 's Island. 



Some specimens are of a faint reddish colour in the upper 

 whorls j hut this may be from the dried animal within. The 

 whorls are very much incurved at the suture, so much so that 

 almost a channel is produced. 



10. Scissurella supraplicata, sp. nov. 



Testa helicilbrmis, spira brevi, anguste perforata, tenuis, semipellu- 

 cida, alba, epidermide caduca crassiuscula pallide olivacea amicta ; 



anfractus 3, primus ? (abruptus), secundus convexiusculus, 



superne aliquanto planulatus etradiatim arcuate plicatus, ultimus 

 maguus, paululuru supra medium carina duplici tenui (cum 

 scissura continua) succinctus, supra carinam radiatim arcuate 

 plicatus, infra earn incrementi lincis striatus ; apertura maxima, 

 irregulariter circularis, ad marginem basalem levissime expansa ; 

 peristoma continuum, scissura profunda angusta. 



Operculum corneum, ? 



Diain. max. 1^ mill., diam. min. 1, alt. 1. 



Hub. Swain's Bay, Kerguelen's Island. 



The deep narrow slit is situated between the two thread- 

 like keels, as is the case in several other species. The oper- 

 culum is too far within the aperture to allow of examination. 



11. Solenella gig antea, sp. nov. 



Testa elongato-ovalis, postice subrhomboidalis, parum imequilateralis, 

 postice longior, aliquanto ventricosa, versus marginem posticum 

 compressiuscula, epidermide nitidissima (vel fusco- vel flavo- 

 olivacea) induta, incrementi lineis concentricis (interdum promi- 

 nentibus) ornata, et striis paucis tenuissimis et confertis ab um- 

 bonibus usque ad medium lateris antici radiata, intus alba, iri- 

 descens ; margo dorsalis utrinque leviter declivis, ventralis vix 

 arcuatus ; extremitas lateris antica brevioris paululum supra me- 

 dium leviter acuminato-rotundata ; postica superne subrostrata, 

 medio leviter sinuata ; dentes cardinales postice circiter 32, an- 

 tice 11 ; pallii impressio perprofunde sinuata. 



Lat. 62 mill., long. 32, crass. 19. 



Hah. lloyal Sound, Kerguelen's Island. 



This magnificent species is by far the largest yet described 

 of this genus, and is at once known from the other three 

 species by its difference of form. The posterior end pouts in the 

 same manner as in the North -American Yoldia thraciaformis. 

 The epidermis in young and half-grown specimens is of a 

 bright yellowish olive colour ; but in the adult shell it becomes 

 of a dark olive-brown, and is much eroded in the umbonal 

 region ; it is slightly reflexed within the margin of the valves. 

 The few radiating contiguous striations towards the anterior 

 end furnish another very distinctive character. 



