CEPHALOPODS OF THE PHILIPPINE ISLANDS 163 



Type. — Senckenbergisches Institut, Frankfurt am Main. 



Type locality. — Red Sea. 



Discussion. — Pickford's unpublished monograph (see p. 2) con- 

 tains a full and detailed consideration of the relationships of 0. 

 horridus with 0. jilainentosus and 0. niveus; Dr. Pickford places the 

 two latter in synonymy. The material at hand does not permit an 

 evaluation of this problem, but the writer has accepted horridus as 

 the valid name. The two small males, however, show little or no 

 indication of the typical horridus coloration and apparently are more 

 rugose and with far more prominent cirri than I have found in the 

 literature. Subsequent study may show that these specimens belong 

 to another species but for the time being they seem better referred to 

 horridus. 



Distribution. — From the east coast of Africa through the Indian 

 Ocean and the Pacific region. They are here first recorded from the 

 Philippines. 



Octopus teuthoides Robson, 1929 



Plate 4 

 Octopus teuthoides Robson, 1929, p. 133. — Adam, 1934, p. 22. 



Material. — 5 specimens, ML 14.3-17.0 mm., taken in Panabutan 

 Bay, Mindanao, Feb. 5, 1908, electric light; USNM 575448. 



Description. — The five specimens before me have been placed in 

 this species until such time as the status of teuthoides is cleared up. 



The mantle is spindle-shaped, its width about 35 per cent of its 

 length. It is widest in the anterior third and tapers to a sharp 

 point. The smaU head, about 30 per cent of the mantle length in 

 width, is narrow and bears small eyes. The head is separated from 

 the mantle by a constricted neck region. 



The arms are relatively short, a little more than 50 percent of the 

 total length, and slender, in the order 1.2.3.4, The suckers are 

 biserial, small, but distinct and uncrowded. The web is shallow, 

 (WDI 18-19) and in the order B=C=D.A.E. or B=C=-D.E.A. 



The funnel is small, free for about one-third of its length, and 

 has a well-developed locking apparatus, especially prominent in the 

 mantle where a deep sharp pit is found. The funnel organ consists 

 of a narrow, sharply angled W. There is a well-developed adductor 

 ■pallii medialis. The gills are long and there are 10 to 12 lamellae 

 per demibranch. 



The skin is smooth, and in the preserved specimens there were no 

 observable chromatophores. 



One specimen, ML 15.0 mm., does not appear to be conspecific. 

 The mantle is slender and pointed, but the head is much wider and the 

 arms shorter and heavier. In addition, there was a distinct circlet 



