PROCYMBULIIDAE 285 



columnellar margin. Usually this is amber tinted (Vayssiere, 1915, p. 141). It has been 

 recorded from the eastern Pacific and from Chinese seas to 40° N and 170° W (Boas, 

 1886). 



Genus Peraclis, Forbes (emend.), 1844 



Peraclis di versa, Monterosato, 1884. 



Spinalis diversa (Monterosato), 1884. 

 Perade diversa, Locard, 1897. 

 Peraclis bispinosa, Pelseneer, 1888. 



St. 295. Young-fish trawl, 2500-2700 (-0) ni. : i specimen. 

 6° 55' 00" N, 15° 54' 00" ^^', 2 m. net, 0-800 m. : 8 specimens. 



The first of the above hauls was made off the Gulf of Guinea and the other to the 

 north-east of Ascension Island. 



The principal differences between this genus and Li^nacma are that Peraclis is cha- 

 racterized by having a well-specialized gill and a radula with rudimentary lateral teeth 

 so that the formula is (i) i-i-i (i). A large cephahc lobe is developed, bearing rudi- 

 mentary tentacles of equal size. The fins, which are broad and plate-like, have a con- 

 tinuous margin without lobes. A caecum appears to be absent from the intestine. 



The present species has a shell with three whorls, the last of which is very wide. The 

 suture has transverse folds. The surface of the shell is covered with a beautiful hexagonal 

 network except on the last quarter or third, which is smooth. The outer lip is generally 

 broken, but, if perfect, a third spine appears. The shell measures 8-9 mm. in length by 

 about 6 mm. in width at the mouth. The sub -circular operculum has a spire of six turns. 



Distribution. Mediterranean. Atlantic. Bonnevie (1913) observed that this species 

 was taken by the Michael Sars North Atlantic Expedition up to lat. 46° 58' N, not 

 among surface plankton, but mainly from a depth of ca. 1000 m., and its distribution 

 was in conformity with the extension of a water layer with a temperature of ca. 6-8° C. 

 and a salinity of 35-35'5 



0/ 

 / 00 • 



Family PROCYMBULIIDAE 



Genus Procymbulia, Meisenheimer, 1905 



Procymbulia valdiviae, Meisenheimer, 1905. 



St. 37. I m. tow-net, horizontal, 90 (-0) m. : i specimen. 



St. 62. I m. tow-net, horizontal, 90 (-0) m. : 5 specimens. 



St. 66. I m. tow-net, horizontal, 45 (-0) m. : 2 specimens. 



St. 71. Young-fish trawl, 2000 (-0) m. : 7 specimens. 



St. 72. 4-5 m. tow-net, 2000 (-0) m. : i specimen. 



St. 78. Young-fish trawl, 1000 (-0) m. : i specimen. 



St. 85. 4-5 m. tow-net, 2000 (-0) m. : i specimen. 



St. no. I m. tow-net, horizontal, 178 m. : i specimen. 



St. 114. 4-5 m. tow-net, 650-700 m. : i specimen. 



St. 238. I m. tow-net, horizontal, 148 m. : 2 specimens. 



St. 239. 4-5 m. tow-net, 1050-1350 (-0) m. : 2 specimens. 



St. WS 68. 70 cm. tow-net, vertical, 750-500 m. : ? i very young specimen. 



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