BIHANG TILL K. SV. VET.-AKAD. HANDL. BAND 1. N:0 13. 19 



Length 0,070 — 0,204 m.m. Breadth and thickness 0,0204 

 fn.in. Spetsbergen Hackluyts. Brandwyns Bay (10 — 15 fths), 

 Kings Bay (160 fths), Greerdand, rare. 

 "Pl. III, fig. 16 a SV. h FV. 



I ? 81. Pleurosigma decorum Sm (Syn. I, pag. 63, Pl. XXI, 

 dg. 196). Spetsbergen Kings Bay (160 fths). 



Very widely distributed ex. gr. on the coasts of the North 

 >ea, Mediterraneau Sea (Gr.), Honduras (Gr.) Tahiti (Gr.), 

 ^ape of Good Hope (Gr). Vest Indies (Cl). 



S2. Pleurosigma formosum Sm (Syn. I, pag. 63, Pl. XX, 

 \^. 195). Spetsbergen Kings Bay (160 fthms). Greenland com- 

 '<\pn in most seas. 



-j 83. Pleurosigma delicatulum Sm (Syn. I, pag. 64, Pl. XXI, 

 .fe5. 202 & Fl. elongatmn Sm 1. c. Pl. XX, fig. 199) Spets- 

 ,rgen Schoal Point, Brandwyns Bay, Hackluyts, Amsterdam 

 %^ Finmarken Grötsuna. 



, 84. Pleurop'*' 'ntermer-um Sm (Syn. I, pag. 64, Pl. XXI, 

 ^fcr 200). Spetsb^ Schoal Point. 



85. Pl''urosigma k igum Cl!'"N. Sp. Very long and narrow, 

 aboiit 40 times longer than broad, *lightly sigmoid, ends some- 

 what obtuse; n ediau line very slirHly sigmoid. Striee coarse, 

 oblique, about 30 in 0,02 5 m.m. '^olour of the dry valve 

 chestnut-brown. Length 0,98 m.m. Br. 0,024 m.m. Spets- 

 bergen Hackkiyts. Greenland. 



Pl. III, fig. 14. 



86. Pleurosigma naviculaceum Bréb (Fl. transversale Sm. 

 Syn. II, pag. 96). Geenlaml. Davis Strait in mud from great 

 depths. 



87 Pleurosig na angulatum Sm (Syn. I, pag. 65, Pl. XXI, 

 fig. 205). L '^bergen Hackluyts, Kings Bay. Finmai^ken. 

 Greenland. 



88. Pleurosigma obscurum Sm. (Syn. I, pag. 65, Pl. XX, 

 fig. 206). Spetshergen Hackluyts. 



89. Pleurosigma rigidum Sm (Syn. I, pag. 64, Pl. XX, 

 fig. 198). Spetsbergen Hackluyts, tolerably rare. Greenland rare. 



