352 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



and on those of the third pair the large single scale is usually seen 

 which is continued on the following pores. This scale, however, is 

 sometimes accompanied by a second smaller scale. I do not find 

 on the Albatross specimen the infradental papilla described by 

 -Brock, but instead a small group of two or three papillae quite iden- 

 tical with those in the Siboga specimens. 



In order to permit comparisons between the genera Ophioconis, 

 in the restricted sense, and Ophiurodon, I include a photograph of 

 the ventral surface of an Ophioconis forbesi which I collected at 

 La Ciotat (pi. 81, fig. 1). 



OPHIURODON PERMIXTUS (Koehler). 



Ophioconis permixta Kcehleb ('05), p. 14, pi. 2, figs. 4, 7. 

 Ophiurodon permixtus Matstjmoto ('15), p. 84. — H. L. Claek ('15), p. 

 219.— Matsumoto ('17), p. 315. 



Locality. — Albatross station 5400; north of Cebu; Tanguingui 

 Island Light bearing N. 77° W., 41.70 kilometers (22.5 miles) dis- 

 tant (lat. 11° 24' 24" N., long. 124° 05' 30" E.) ; 45 meters (25 fath- 

 oms) ; March 16, 1909 ; S., Sh. 



A single specimen. 



Notes. — The diameter of the disk is 6 mm. The specimen is un- 

 fortunately in rather bad condition. The arms are broken off near 

 the base, and the disk is somewhat damaged, especially on the dorsal 

 surface. The identification is, nevertheless, certain, and it may be 

 stated that the specimen agrees well with the type which the Siboga 

 dredged in the Sunda Archipelago between 75 and 94 meters (41 

 and 52 fathoms). 



Family OPHIOLEPIDIDAE. 



Remarks. — Before describing the species which belong to the fam- 

 ily Ophiolepididae it seems to me well to consider the character 

 on which Matsumoto has divided it; that is, the position of the 

 mouth tentacle pores of the second pair, and to add a few remarks 

 on the manner of occurrence of these pores in the genus Ophiura, 

 as well as in those genera which have been split off from it by Mat- 

 sumoto and by H. L. Clark, as I mentioned at the beginning of this 

 memoir. 



The family Ophiolepididae was divided by Matsumoto into two 

 subfamilies according to whether the mouth tentacle pores of the 

 second pair opened entirely into the mouth slits (Ophiolepidinae) 

 or whether they opened more or less completely outside of these 

 slits (Ophiomastinae). This latter subfamily includes, among oth- 

 ers, the genera Ophiomastus, Ophiotypa, Ophiomisidium, Ophio- 

 phycis, etc., as well as the genera Ophiura, Amphiophiura, Stego- 

 phiura, etc. 



