HOLOTHURIOIDEA 



429 



Gastropod Entoconcha mirabilis Job. Miiller, known only from 

 L. digitata from the Adriatic. 



In British seas Leptosynapta inhcerens appears to be common 

 along the west coasts from Plymouth to the Sbetlands ; also 

 recorded from the Firth of Forth and St. Andrews on the east 

 coast. It is elsewhere known with certainty from Lofoten on the 

 Norwegian coast to the Atlantic coasts of France, whereas it is 

 perhaps doubtful whether the " inhcerens " of the Mediterranean 

 is really identical with the north European form. Likewise it is 



Fig. 262. — Anchor plate and anchor of Lejjtosynapta bergensis (1), L. 

 inhcerens (2), L. decaria (3), and L. minuta (4). (After Ostergren (1-3) 

 and Becher (4).) 1, x ca. 80 ; 2-3, xca. 135; 4, x ca. 340. (From 

 Danniark's Fauna.) 



doubtful whether the North American and Japanese " inhcerens " 

 are really that species. Bathy metrical distribution also rather 

 uncertain, on account of the former insufficient distinction of the 

 species, but it occurs at any rate from within tide marks down to 

 50 m.i 



[Leptosynapta bergensis (Ostergren) .^j (Fig. 262, L) 

 Tentacles 12, usually with 8-9 pairs of digits, which are all 

 short and, excepting the proximal pairs, equally long ; also the 



^ It is recorded from a depth of 173 m. in the Bay of Biscay 

 (" Porcupine " Stat. 35). 



- Usually this species is regarded as identical with L. Galliennii (Hera- 

 path). The difference in the anchor plates would, however, seem to be 

 too great for simply uniting them, and the present author thinks it more 

 correct to follow Ostergren in regarding them as separate species. 



