10 



var. borealis, Phil. 



Fusas borealis, Phil. Abb. und Beschr. III 1850 Pg. 118, 



Fig. 5. 

 Fusus fornicatus, Reeve IV 1847 Pl. 16, Fig. 63. 

 Tritonium antiquum var. communis. Midd. Beitr. Malaco 



Eos. Pg. 131, Fig. 3—6. 



Forekomst: St. 366—60 F., St. 373—30 F. 



Paa St. 366 (Magdalenabay, Spitsbergen) forekom 

 saavel den glatte knudede, som alle Overgange baade til 

 foregaaende Varietet og til den ved den norske Kyst al- 

 mindelige carinerede Form. 



Middendorf har i „Beitråge Mal. Ros." og Dr. Leche 

 i - 'Øfersigt oter Novaja Semlja och Jenissej Hafsmollusker" 

 tilfulde med Illustrationer paavist at N&ptunea borealis Ph. 

 gaar over i despecfa Lin. 



Ægkapslerne er vel kj endte. 



Fmbryonet (Tab. I, Kg. 7 a. b) udtaget at' Ægkapsler, 

 funden paa St. 366 og sandsynligvis tilhørende Formen 

 borealis ligner N. antiquas. I Kapslerne faudtes fra 3 til 

 7 Embryoner, men som Regel var flere deforme, hvor det 

 større Antal var tilstede. 



Tænderne t Tab. IV, Fig. 8—10) er vel kjendte fra Loven, 

 Troschel, Sårs o. fl. De Variationer, som jeg har obser- 

 veret, er gjengivet i Fig. 8, 9 og 10. 



Af 7 undersøgte Exemplarer fandtes hos; 



1 Explr. 3 Tænder paa Centralpladen 3 Tænder paa Side- 



pladerne. 



2 ,. 3 „ - — 3 paa den ene do. 



og 4 ,, „ anden do. 



2 „ 3 „ 4 Tænder paa do. 



2 „ 4 — 4 — „ do. 



Hos Fig. 10 viser Centralpladen sig af en ualminde- 

 lig Bredde. 



Apex uregelmæssig. 



Subgen Sipho, (Klein) 



Apex uregelmæssig. 



Neptunea (Sipho ) islandica, Chmn. 



Tab. 1, Kg. 9—12 og Tab. VI, Kg. 1—2. 



Fusus islandicus, Chmn. Conch. Cab. IV Pg. IV Pg. 141, 



Fig. 1312, 1313. 



Forekomst: St. 10, 25, 124, 192, 237, 261, 286, 

 312, 323 og 326 fra 90 til 658 Favne. 



Arten gaar saaledes ned til en Dybde af over 650 

 Favne (St. 312) hvorfra 2 levende, men meget tyndskallede 

 Exemplarer blev optaget. Dens Nordgrændse er Spits- 

 bergen, i hvis Fauna den nu for første Gang indføres. 



var. borealis, Phil. 



Fusus borealis, Phil., Abb. und Beschr. III. 1850. p. 118. 



fig. 5. 

 Fusus fornicatus, Reeve IV, 1847, Pl. 16, fig. 63. 

 Tritonium antiquum var. communis, Midd. Beitr. Malaco 



Ros., p. 131, figs. 3 — 6. 



Habitat: — Stats. 366 (60 fathoms) and 373 (40 f.). 



At Station 366 (Magdalena Bay, Spitzbergen) occurred 

 not only the smooth, protuberant,' but all the other transi- 

 tion-forms, leading up alike to the foregoing and to the 

 carinated variety common on the ^Norwegian coast. 



Middendorf. in his "Beitrage Mal. Ros.," and Dr. 

 Leche, in his "Øfersigt øfer Novaja Semlja och Jenissej 

 Hafsmollusker." have shown that Neptunea borealis, Ph. is 

 merged in desy>ecta Lin. 



The egg-capsules are well known. 



The embryos (Pi. I. fig. 7 a, 5) taken from the capsu- 

 les brought up at Station 366, and most likely belonging 

 to the variety borealis, resemble those of N. antiqua. Each 

 capsule contained from 3 to 7 embryos; but frequently 

 some were deformed when the larger number were present. 



The teeth (Tab. IV. fig. s_ 10) are well known from 

 Loven's, Troschel's, Sars's, and other zoologists' drawings. 

 The variations observed by myself are represented in figs. 

 8, 9, and 10. 



Of 7 individuals examined — 



1 had 3 cusps on the central plate and 3 on both of the 



laterals. 



2 „ 3 - - - - - - 3 on one of the lat., 



the other having 4. 

 2„3--- - - -4 on each of the lat. 



2 „ 4 4 - - - - - 



In fig. 10, the central plate exhibits unusual breadth. 



Apex irregular. 



Subgen. Sipho. (Klein). 

 Apex irregular. 



Neptunea (Sipho) islandica, Chmn. 



PI. I, figs. 0—12 and PL VI, figs. 1—2. 



Fusus islandicus, Chmn., Conch. Cab. IV, p. 141, figs. 



1312, 1313. 



Habitat: — Stats. 10. 25. 124, 192, 237, 261. 286, 

 312, 323, and 326; from 90 to 658 fathoms. 



This species occurs, accordingly, in upwards of 650 

 fathoms (Stat. 312), 2 living, but exceedingly thin-shelled 

 specimens having been brought up from that depth. Its 

 northern limit of distribution is Spitzbergen, in whose fauna, 

 this species now appears for the first time. 



