294 REPORT 1868. 



Gytheropteron multiforum (Norman). Common, 30-140 fathoms. 



cdatum, G. 0. Sars, Overs, af Norges mar. Ostrac. p. 81. "Lateral 



protuberance very large, triangular, slightly inclined downwards, and 

 running out into a strong mi&ro,' which projects at the sides ; its hinder 

 margin furnished with (about twelve) flattened teeth, the two inner- 

 most much larger than the rest, and in the form of quadrangular serrated 

 laminae. Lateral aspect of female elongated ovate, the greatest height, 

 which is in the middle, much less than half the length, equally rounded 

 in front, behind projecting into a very large process, which is obliquely 

 truncate at the end ; dorsal margin regularly arched, ventral slightly 

 sinuated, the lateral protuberance projecting below in the centre of the 

 ventral margin. Dorsal aspect almost cruciform, the greatest width 

 (between the lateral protuberances) ' exceeding twice the height, and 

 even somewhat surpassing the length, suddenly attenuated in front, and 

 more gradually behind. The shell of the male scarcely differs from that of 

 the female except in the smaller size. Yalves white, pellucid, smooth, 

 finely toothed on the front margin." A single specimen of this interesting 

 addition to our fauna, in sand dredged 5-8 miles east of the Island of 

 Balta, in 40-50 fathoms. The form is most remarkable, on account 

 of the immense projection of the lateral ala3 and their dentated edge. 



rectum, Brady. The type was " dredged by Mr. D. Eobertson, in 



Lerwick Bay, Shetland, in a depth of 12-14 fathoms " (G. S. Brady). I 

 have procured a second specimen in St. Magnus Bay, in about 60 

 fathoms. 



Bytlwcyihere simplex (Norman). St. Magnus Bay, and 10 miles east of 

 Balta, 50-73 fathoms. 



constricta, G. 0. Sars. "Widely distributed in deep water to 100 



fathoms. 



turyida, G. 0. Sars. St. Magnus Bay, and 10 miles off the Island of 



Balta, 50-73 fathoms. 



tenuisswia, n. sp. Elongated, doubly fusiform, both extremities acu- 

 minate, equally gradually attenuated to sharp central points ; greatest 

 height central ; length to height as 3-4 to 1 : dorsal margin gently con- 

 vex throughout ; ventral slightly nexuous, but slightly arched through- 

 out the greater part of its length ; both margins gradually approaching 

 each other towards the extremities : valves very thin and fragile, their 

 surface perfectly smooth and glabrous. Dorsal view remarkably com- 

 pressed and greatly elongated, widest in the centre, and gradually be- 

 coming narrower (it is only possible for them to become in the slightest 

 degree narrower) to the extremities. Length >7 L- inch. 



St. Magnus Bay, 30-60 fathoms. I place this species provisionally 

 in the genus Bytlwcy there, as it seems more nearly related to B. sim- 

 plex in general structure than to any other Ostracod. The lateral aspect 

 of the carapace finds its nearest counterpart in Bairdia angusta, G. 0. 

 Sars; but whereas that species is tumid this is exceedingly compressed. 



Pseudocy there caudata, G. 0. Sars. 20-25 miles K.N.W. of Burrafirth, in 

 100-140 fathoms ; 10 miles east of Balta, 50-73 fathoms ; and St. 

 Magnus Bay, 30-60 fathoms. 



Sclerochilus contortus (Norman). Very common at all depths, 1-70 fathoms. 



Paradoooostoma varialile (Baird). In extraordinary profusion on Laminarirc 

 in Balta and Bressay Sounds ; also Out Skerries and Hillswick. 



Normani, Brady. Among Laminaria3, Bressay Sound, St. Magnus Bay, 



and 5-8 miles east of Balta, 5-50 fathoms, alive. 



ablreviatum, G. 0. Sars. St. Magnus Bay, 50 fathoms. 



