1909] Mcdendon: Tht Ophiurans of th San Diego Region. 37 



plates small and diamond shaped. Six to eight rudimentary arm 

 spines. Color of preserved specimens grey. 



This is a deep-sea cosmopolitan species. Sim Diego M. B. I... 1072 (La 

 Jolla Sta. Ill, 600 fathoms). 



Genus Ophiura Lm. L816. 



Ophiolepis M. & T. 1842 (partim). 

 Ophioglypha Ly. 1865. 



Disc covered with plates or scales which are often swollen. 

 Radial shields naked and swollen. Teeth. No tooth papillae. 

 Month papillae long within, but small and short near outer end 

 of the mouth slit and partly hidden by the scales of the month 



tentacles. Arm spines short and sn th. rarely exceeding the 



length of a joint. Tentacle scales numerous, the innermost pair 

 of tentacle pores shaped like slits surrounded by numerous ten- 

 tacle scales ami opening diagonally into the month slit. In the 

 disc, over the base of the arm. is a notch usually edged with pa- 

 pillae. Two genital openings starting from the sides of the month 

 shield. 



Ophiura lutkeni Ly. 



Figs. .32, 33. 

 Proc. Bost. Soc. Nat. Hist., VII, p. 197, 1860. 



Diameter of disc 8 mm. Length of arm about 5 1 -_, times 

 diameter of disc. Disc flattened, covered above with slightly 

 swollen scales and radial shields. Each larger scale surrounded 

 by smaller ones. Radial shields small, ovoid, pointed within. A 

 notch above the base of arm. Interbrachial spaces below covered 

 with slightly swollen scales. Eight pairs of month papillae, the 

 inner ones spine-like and separated, the outer four broad and 

 close together. Teeth. No tooth papillae. Mouth shields pen- 

 tagonal, the inner angle acute, the others rounded, lateral edges 

 emarginate. Side month shields long, narrow and meeting 

 within. Genital openings beginning at the sides of the month 

 shield. First and sometimes second tentacular openings, with 

 two or three flat scales, succeeding four or five each with one flat 

 scale and one minute spine-like scale, the remainder each with 

 one flat scale. Ventral arm plates twice as broad as long, small 



