18 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 8 



Remarks. — This species can be readily distinguished from other 

 known members of the genus by the unique inner tentacle scale. It is 

 strange that after dredging in Tenacatita Bay on seven different occa- 

 sions this notable new species should now be taken for the first time. The 

 name lonchophorus has reference to the unique spear-shaped inner ten- 

 tacle scale. 



Ophiophragmus ophiactoides, new species 

 Plate 3, Figs. 5-7 



Description. — Disk diameter, 7 mm. ; arms, about 38 mm. long. Disk 

 covered with small scales ; only a few specimens had a large central plate ; 

 scales enlarged about the interradial margins and radial shields. Inter- 

 radial fence is composed of small, blunt, rounded marginal papillae, vary- 

 ing from 5 to 23 in number in each interradius ; usually there are 15 to 20. 

 Papillae near the radial shields are the largest, those midway of the arms 

 smallest and finest. Radial shields oval, longer than wide; ^4 the diameter 

 of the disk, separated proximally by a single (sometimes a double) series 

 of long, narrow scales, in contact distally or in some specimens separated 

 even there by a single narrow scale. 



First upper plate triangular, broader than long, angle within, distal 

 margin convex. Succeeding plates oval shaped, twice as broad as long, 

 with convex lateral margins, proximal margins convex, distal margins 

 almost straight, wider than proximal margin. On the distal margin is a 

 median notch that varies from a slight indentation to a large notch, which 

 gives the appearance of a concave margin. Side arm plates small, scarcely 

 meeting below. Three arm spines, longer than an arm segment, oval and 

 blunt, flattened at the tips; lower spine rather long; median slightly the 

 longest ; upper spine shortest and flattest. 



Oral shields triangular, longer than broad. Adoral plates twice as 

 broad as long, widening distally and extending to the genital slits, scarcely 

 meeting within. Three oral papillae on a side, outermost largest, broad 

 and oval ; median narrow and rounded ; apical heavy and blunt. Teeth 

 prominent, flat and rounded, in some specimens somewhat bilobed. 



Interbrachial spaces below covered with fine scales. Genital slits equal 

 to 6 arm segments in length. First under arm plate small, as broad as long, 

 others hexagonal, broader than long, proximal margin straight, proximal 

 lateral, lateral, and distal margins slightly concave. Tentacle scales 2, at 

 right angles to each other ; the one on the side arm plate the largest. 



