49G ox THE FAUNA AND BOTFO^r-DEPOSITS NEAR THE 30-FAI. LINE 



southern species, and has been recorded from Malaga and Algiers. 

 There are also records from the Irish Sea. 



Pholadidca pa2Jiiracca. Like Pholas pao-va this species was taken in 

 one haul only, viz., haul 4 on the Prawle Stony Ground. It was 

 plentiful in pieces of red trias rock. 



Tlie species is recorded by Forbes and Gwyii Jeffreys from new red sandstone or trias, 

 peat, submarine forest, sandstone, and hard clay. It has been obtained from the Englisli 

 Channel, Irisli Coasts, and west of Scotland (_/?(7c Jeffreys, No. 55). The Talisman expedi- 

 tion took it in 60 fiithoms west of Morocco (Locard, No. 69). It is found from low-water 

 mark (South Devon Coast) to SO fathoms (olf the coast of Antrim) [Jellreys]. 



Sn.ricavn rngosa (Table VI.). The variety nrctica was found on 

 grounds of all kinds attached to shells and similar objects, or to the 

 roots of hydroids. 



Hahits. The varieties arctica and minutci do not bore like the 

 common Sacdcava, but are found attached to shells, etc., in deeper 

 water. 



Distribution. GeograpMcal. Locard (No. 69), who regards S. arctica as a distinct 

 species, gives its distribution as coast of Finmark, Norway, England, France, Bay of 

 Biscay, and I\Ieditcrranean. The boring variety is found in all parts of the world. 



Depth. Shore to 700 fathoms (var. arctica, Dauzeuberg, No. 20). 



Pandora obtusa [ = P. inaequivalvis, var. obtusa of Gwyn Jeffreys]. 

 One living example only taken in haul 75 (Ground VII.). The bottom- 

 deposit is one of the coarser kinds of fine sand, and a large stone is 

 recorded in this particular haul. 



Distribution. Geographical. Gwyn Jeffreys (No. 55) distinguishes two varieties of 

 Pandora inaequivalvis ; var. tenuis, with a southern range from Algeria to Guernsey, and 

 north to Shetlands ; var. obtusa ranging from Spitzbergen to the Canaries. 



Depth. Low-water to 100 fathoms, var. tenuis ; between 85 and 100 fathoms (Shetlands) 

 [Gwyn Jeffreys]. Var. obtusa, 7-50 fathoms. 



Bottom-deposit. In sand, Channel Islands, at low-water ; often among Zostera marina 

 (Jeffreys). Usually on muddy ground (Forbes, No. 25). In the British Association Report 

 (1850) Forbes records the species once from mud, twice from mud and stones, once from 

 sand and gravel, twice from gravel, and once from nullipores. 



Lyonsia norvcgica. Taken once only alive in haul 7 on the Bolt Shell 

 Gravel (Ground XVIL). Shells were taken on Grounds XL, XIII., and 

 VII., all of them coarse grounds in the neighbourhood of the Eddystone. 



Distribution. Geographical. Sea of Okhotsk, Iceland, Scandinavia, France, Mediter- 

 ranean, Madeira (Jeffreys). 



Depth. Shallow water (4 fathoms, Jeffreys ; 7 fathoms. Holt, No. 48) to 100 fathoms 

 (Forbes, Brit. Assoc. Rep., 1850). 



Bottom-deposit. Sand (Jeffreys) ; shells, mud, corals, and weed (Holt) ; on shells, stones, 

 and mud (Herdman, No. 40, Vol. IX., p. 37) ; on sand and mud, on stones and mud, on 

 gravel, and on sand (Forbes, Brit. Assoc. Rep., 1850) ; on mixed deposits (sand or gravel 

 and mud) [rctcrsen. No. 96]. From these records I should judge that the species was most 

 frequent upon muddy gravel or sand. 



Sokn ensis has been represented by shells only. It is not unlikely 

 that the species occurs in water of 30 fathoms, though from what is 



