36 



Det er paa Tegningen angivet, at det afbildede Exem- 

 plar har været brudt. Dyret kom levende op. men under 

 Contraktionen paa. Spiritus er den fragile Skal brudt, dog 

 ikke værre, end at den med største Nøiagtighed senere er 

 sammensat, saa jeg tror min Tegning er fuldt korrekt, 

 hvad Form angaar. 



Asbjørnsenia, n. Gen. 



Skallen oval. inæqvilateral, Laasen svag, har i hoire 

 Skal en enkel centralstillet Cardinaltand og i venstre en 

 dobbel, ved hvis Basis sidder en mindre, svag Bitand. 



Asbjørnsenia striata, n. sp. 



Pl. XII, Fig. 14 a, b. 



Skallen hvid, halv gjeiinenisigtig aflang oval, noget 

 sammentrykt, inæqvilateral, fortil kort, truncat, bagtil ud- 



dragen afrundet; Umbonerne er langt foranstillede, men 

 ikke stærkt fremtrædende ; Dorsalranden bøier foran i en 

 skjæv Retning ned mod den truncate anterior Rand, bagtil 

 synker den langsomt og ubetydelig boiet mod den skarpt 

 afrundede posterior Rand, Ventralranden svagt boiet; Laasen 

 svag, i hoire Skal er en centralstillet, noget bagudbøiel 

 Cardinaltand og en stumpvinklet Lateraltand, i venstre en 

 dobbel Cardinaltand og ved sanimes Basis en mindre Bitand. 

 Muskelindtrykkene lader sig ikke med Sikkerhed ndrede. 

 Sculpturen betaar af talrige og tætte concentriske Striæ, 

 kun Umbonerne er næsten glat. 



Størrelse: 3""" anteroposterior og 1.6"™ umboventral 

 Diameter. ' 



Forekomst: St. 173 6—300 Favne. 



Der forekom kun et dødt, men vel vedligeholdt Exem- 

 plar. Hvorvidt man her har et udviklet Individ eller en 

 Unge for sig er vanskeligt at afgjøre. Laasbygningen er 

 mig i ethvert Fald fuldstændig fremmed, saa jeg har fundet 

 det nodvendigt at danne en ny Skegt for den. Vor mage- 



1 Jeg anvender Marqs. dr Gregorios Terminæ lur Maalangi- 



velsen (..Nomenclature des Coquilles" iss;',), da jeg holder disse fol- 

 de korrekteste og vil ikke give Anledning til Misforstaaelser. De er 

 ogsaa anvendt under Gasterodoperne. 



It is stated in the illustration that the specimen 

 illustrated has been injured. The animal was brought up 

 alive, but the fragile shell was broken by its shrivelling in 

 alcohol, - but not more so than permitted it to be put toge- 

 ther with perfect accuracy subsequently, so that, I believe, 

 my illustration is quite reliable as regards the form. 



Asbjørnsenia, n. gen. 



Shell oval, inequilateral, the hinge faint; lias, in the 



right-valve, a central cardinal tooth, and in the left-valve. 



a double one. at whose base a small indistinct secondary 

 tooth is placed. 



Asbjørnsenia striata, n 



PI. XII, tig. 14 «, b. 



sp. 



Shell white, semi-transparent, elongate oval, somewhat 

 compressed, inequilateral, short anteriorly, truncate, poster- 

 iorly attenuated, rounded. The umboes are placed well 

 forward, but not strongly prominent. The dorsal margin cur- 

 ves forward in a slanting direction down towards the truncate 

 anterior margin, and. posteriorly, it sinks slowly and only 

 slightly curved towards the sharply rounded posterior 

 margin. Ventral margin faintly rounded ; the hinge delicate, 

 in the right-valve there is a centrally placed, somewhat 

 posteriorly bent, cardinal tooth, and an obtuse angulated 

 lateral tooth; in the left-valve, there is a double cardinal 

 tooth and, at its base, a small secondary one. The muscular 

 impressions cannot with certainty be elucidated. The 

 sculpture consists of numerous, and compact, concentric 

 striæ. the umboes, alone, being almost smooth. 



Size. Anterioposterior diameter, 3""", and umbo-ven- 

 tral diameter, 1.6™". 1 



Habitat: Station, No. 173 h. Depth, 300 fathoms. 



One dead, hut well preserved, specimen, only, was 

 obtained. Whether we have before us. here, an adult, or 

 a juvenile specimen is difficult to determine. The hinge 

 is, at any rate, quite strange to me, so that I have found 

 it necessary to establish a new genus for it. I have 



1 I make use of Marqs. de Gregorios terms for the measure- 

 ments (..Nomenclature des Coquilles" L883) as 1 consider them to be 

 the most accurate, aud as unlikely to occasion misunderstanding. 

 They are. also, used with reference to the Gastopods. 



