22 



KR. BONNEVIE. 



[REP. OF THE "MICHAEL SARS" NORTH 



Station 



51 



53 



62 



82 



84 



88 



Date 



5 /e— 6 /6 



s /e- 8 /e 



20 /6— 21 /6 



i»/ 7 



15 /? 



18/, 



D •••„ N - 



31° 20' 



34° 59' 



36° 52' 



48° 24' 



48° 4' 



45° 26' 



Position ,„ 



35° 7' 



33° 1' 



39° 55' 



36° 53' 



32° 25' 



25° 45' 



Depth in m. 















0- 50 



— 



— 



— 



— 



— 



— 



50— 100 



— 





— 



— 



— 



— 



100— 250 



— 



— 



— 



— 



— 



— 



250— 500 





— 



-- 



— 



— • 



— 



500— 750 



— 



— 



— 



2 



— 



— 



750—1000 



— 



1 



— 



— 



— 



— 



1000—1250 



1 



— 



1 



— 



— 



1 



1250—1500 



— 



1 



— 



— 



1 



— 



Number of individuals of Clio falcata. 



more turns to the dorsal side (4, fig. 16—17), where it 

 crosses the stomach in a direction from left to right, and 

 finally back again, so that the anus is found on the left 

 side of the body (a fig. 16). As will be shown below, 

 this long and complicated passage of the intestine proves 

 to be of great interest when compared with that in other 

 forms. 



The genital gland occupies the posterior part of 

 the body behind the liver (g.gl. fig. 16 — 17), while the 

 accessory glands are found anteriorly on the right side 

 (ace. gl). Unfortunately I did not succeed in following 

 the course of the genital duct between these two glands; 

 but very probably it takes its origin from the left side of 

 the genital gland. 



The nervous system is of interest in so far as the 

 visceral and abdominal ganglia form a single symme- 

 trically developed mass — as in Limacina hellcoides, 

 but while in the latter species the abdominal nerve leaves 

 the gangliar mass in a right-sided direction, in Clio falcata 

 it follows the oesophagus on its course towards the left 

 side of the body. 



The radula (textfig. 21) is well developed. The 

 large median and lateral teeth are longitudinally striped 

 and denticled along both margins, while the distal end 

 of each of them forms a sharp pointed tooth. 



Colour: The whole animal is, with the exception 

 of the pallial gland and the end-plates of the tentacles, 

 of a dark greyish-violet colour (see fig. 13, pi. II). The 

 shell is colourless. 



Size: In the largest specimens the shells attain a 

 length of about 15 mm., with a maximum breadth of 6 

 or 7 mm. 



Geographical distribution. The few scattered 

 specimens previously recorded were all taken in the 

 Atlantic Ocean, but at places so far apart as Davis strait 

 and the South American coast (Pelseneer). Deposit shells 

 of this species have been taken off the Azores and the 

 Canary Islands (Pelseneer), and complete animals were 

 found in the Northern Atlantic in latitude 37° 25' N. 

 (Munthe) to 44° 31' N. (Pelseneer). 



During the "Michael Sars" expedition Clio falcata 

 was found at six stations, and as will be seen from the 

 table it must, like Peraclis diversa and Limacina helicoides, 

 be considered a deep-sea species confined to the cold 

 bottom-water or the layers immediately above it. 



Clio (Euclio) cuspidata Bosc. 

 PI. Ill, fig. 21, 26. 



The structure of this species is well known, so I shall 

 here only mention a few facts of interest for comparison 

 with other forms or unobserved by earlier investigators. 



A comparison with Clio falcata proves that: 



1) The ventral lobe of the foot is somewhat reduced, 

 so that it does not fully cover the dorsal (lateral) lobes, 

 which are more rigid than in C. falcata, but still folded 

 during rest (fig. 21). 



2) The triangular head-lobe is rudimentary. 



3) The membranous mantle-margin is not so broad 

 as in C. falcata, but it bears the same lobe-like gill (fig. 

 21, 26) on the right side of the body. 



4) The transverse striation of the pallial gland is 

 less conspicuous. 



Station 



10 



23 



29 



42 



45 



49 



53 



56 



58 



62 



87 



88 



92 



98 



101 



Date 



»/«-««/* 



5/- 6 /. 

 lo /» 



9 /5— 10 /5 



23 h- 2i /s 



2s /5- 2!, /o 



Ve 



8 /6-9/6 



">/e - u /» 



n/6_i3/|. 



2 °/6- 21 /e 



17 /7 



18/, 



23/7_24/ 7 



5 /s 



Vs— 7 /s 



Position «; 



45° 26' 

 9° 20' 



35° 32' 

 7° 7' 



35° 40' 

 7° 55' 



28° 2' 



14° 17' 



28° 42' 

 20° 0' 



29° 6' 

 25° 2' 



34° 59' 

 33° 1' 



36° 53' 

 29° 47' 



37° 37' 

 29° 25' 



36° 52' 

 39° 55' 



46° 48' 

 27° 46' 



45° 26' 

 25° 45' 



48° 29' 

 13° 55' 



56° 33' 

 9° 30' 



57° 41' 

 11° 48' 



Depth in m. 



0- 50 



50— 100 



100- 250 



250- 500 



500- 750 



750—1000 



1000—1250 



1250-1500 



1 



— 



3 



_ 



2 



1 



13 



1 



2 

 2 



1 



1 



1 



1 



1 



1 



2 



1 



4 



1 



Number of individuals of Clio cuspidata. 



