MUSEUM OF COMPARATIVE ZOOLOGY. 113 



Ophiomusium Lymani Ww. Thom. 



Ophiomusium Lymani, Deptlis of the Sea, p. 172, Figs. 32, 33. 1873. 



The specimens from the following widely separated stations showed certain 

 minor differences. For example, those from Station 235 had more arm-sj^ines 

 and rather more numerous lower disk-plates, and the tentacle-scales were en- 

 tire, instead of divided. I have deemed it Lest to keep the varieties together 

 for the present. 



Station 45, 1245 fathoms, 1 specimen. Station 50, 1250 fathoms, 12 speci- 

 mens. Station 76, 900 fathoms, 1 specimen. Off Tristan d'Acunha, 1100 

 fathoms, 7 specimens. Station KiO, 700 fathoms, 1 specimen. Station 191, 

 800 fathoms, 4 specimens. Station 235, 565 fathoms, 5 specimens. Station 

 296, 1825 fathoms, (only arras.) 



Ophiomusium laqueatum sp. nov. 



Platel. Figs. 14-16. 



Special Marks. — Upper disk covered by large swollen radial shields, with 

 minute imbricated scaling in centre, arms wide and thick, with side arm-plates 

 much swollen and rounded. Upper arm-plates broad, diamond-shape. 



Description of an Individual (Station 192). — Diameter of disk 14 mm. 

 Width of arm 3.5 mm. Mouth-papilla) six or seven on each side, and one, dia- 

 mond-shaped, at angle of jaw. Mouth-shields ovoid, slightly pointed within ; 

 length to breadth 2 : 1.3. Side mouth-shields long, narrow, having curved 

 sides, wider without than within, where they nearly or quite meet ; length 

 2.3 mm. Genital scales very long and narrow, extending from mouth-shield 

 to margin of disk, and bearing on their free edge an irregular row of close-set 

 oblong papilkx3. Under arm-plates triangular, with an angle inward ; in the 

 first two plates the angle is blunt, becoming more acute in those beyond ; 

 outer edge somewhat curved. Tentacle-scales only on the first three ])lates ; 

 they are minute, circular, two in number, set close together and situated very 

 near the inner angle. Side arm-plates thick, swollen, barely meeting above 

 and below at the inner angle of the upper and under arm-plates. Upper arm- 

 plates near base of arm quadrangular, wider than long ; length to breadth 

 1.3 : 2 ; towards end of arm they are three-sided. Disk covered in centre ' 

 with fine delicate scales, among which appear six larger rounded primary 

 plates, which are widely separated, one in the centre, and one in each brachial 

 space. Radial shields oval, swollen, a little wider without than within, scjia- 

 rated from each other their entire length by two or three long oval scales mingled 

 with finer. Interbrachial spaces on upper surface occupied by two or three 

 rounded scales, bordered by smaller, and of which the largest is on the margin 

 of disk. Under interbrachial space covered by about a dozen thick, rounded, 

 swollen scales, almost concealing the genital scale ; the three largest stand on 

 or near the margin. Four minute pog-shaped arm-spines ; three standing to- 

 gether, low on the edge of the plate ; the fourth placed much above them. 

 Color in alcohol, white. 



Station 192, 129 fathoms, 1 specimen. 



