166 U.S. NATIONAL MUSEUM BULLETIN 2 34 



females from Cavite market can definitely be assigned to this species. 

 The remaining specimens, now no longer available to me, most prob- 

 ably belong to C indicus and their measurements are given below. 

 The small males from Mahinog Island had small, undifferentiated 

 ligulas, but water pores could not be seen. 



The visceral sac is narrow in the males, wider in the females. 

 There is a distinct neck region and the head is small. 



The arms are long and slender with attenuate tips. The arm order 

 in general is 1.2.3.4, with the first arms the longest and the stoutest. 

 The sucker index is larger for the suckers of the first arms than for 

 those of the other arms, and the males usually have specially enlarged 

 suckers on the first and second arms. The most characteristic feature 

 of the species, and upon which the genus was erected, is the water 

 pores located in the interbrachial region near the base of the arms. 

 These pores communicate with small oval pouches on the oral surface 

 of the web and are very difficult to find in preserved animals. 



The third right arm is hectocotylized in the males. The ligula 

 however is small and poorly developed and often is nothing more than 

 a smooth area on the end of the arms. The indices ranged from 1.37 to 

 2.46. 



The gills ranged in number from 10 to 11, not counting the terminal 

 filaments. 



The sculpture is from smooth to slightly rugose on the dorsum of 

 the mantle and head. The color in alcohol is reddish brown but 

 mottled or spotted with lighter colors on the dorsum. 



Measurements and indices of five males and four females of ICistopus 

 indicus (Orbigny) from Mahinog, Camiguin Islands, are: 



Type. — Museum d'Histou*e Naturelle, Paris. 



Type locality. — Celebes. 



Discussion. — The two females from Cavite mai-ket are definitely 

 assignable to Cistopus indicus. The water pores are clearly visible. 

 These specimens constitute the fu'st record of this species from the 

 Philippines. C. indicus, according to Pickford (MS) is a common 

 and commercially important Indo-Malayan species. 



Distribution. — Indo-Malayan region, Philippines: 



