164 U.S. NATIONAL MUSEUM BULLETIN 234 



of minute suckers around the mouth and then three or four uniserial 

 suckere at the base of each arm. In the other four specimens there 

 was no distinct circlet and no uniserial suckers. 



Type. — British Museum (Natural History). 



Type locality.— Walla Id., New Hebrides. 



Discussion. — In the present status of our knowledge of the octopods 

 of the Indo-Pacific, these specimens present a problem. Robson 

 (1929) recognized that these were juvenile forms and suspected a 

 relationship with 0. fusiformis. Adam (1945), on the other hand, 

 thought that they were the young of macropus. Pickford, in her 

 manuscript of the Indo-Malayan octopods, considers, despite no 

 evidence of water pores, that they are the young of Cistopus mdicus. 



I concur with Pickford that they only superficially resemble the 

 young of 0. macropus, which at the same size has much shorter arms 

 by comparison with western Atlantic specimens. The final disposition 

 of the five specimens is still in doubt. 



Distribution. — New Hebrides (Robson); Manokwari, New Guinea 

 (Adam) ; Philippines. 



Octopus macropus Risso, 1826 



Plate 3,b 

 Octopus macropus Risso, 1826, p. 3. — Robson, 1929, p. 101. — Adam, 1954, p. 172. 



Material.— 6 cfd', ML 28.0-52.0 mm., 1099, ML 30.0-44.0 mm., 

 from Mansalay, Mindoro, June 3, 1908. Caught by natives with 

 their hands by torchlight. 



Description. — The sixteen specimens listed above are small, in a 

 very poor state of preservation, and are not suitable for detailed 

 description. In the present material the mantle is sacular, the head 

 small with small to rather prominent eyes. The arms are long, I 

 much longer than the others. In the males the third right arm is 

 hectocotylized, bearing a small but well-developed ligula with inward 

 curled edges and transverse rugae. In most of the males the penis 

 was undeveloped, but when present was long and slender with a small, 

 compact diverticulum. No spermatophores were present in any of 

 the males. There are no especially enlarged suckers in the males. 



Type. — Museum d'Histoire Natm-elle de Nice (not present when 

 searched for in 1961). 



Type Locality. — Mediterranean. 



Discussion. — According to Piclvford (see p. 2), three known octopods 

 in the Indo-Malayan region, of which the Philippines faunally are a 

 part, have long first arms. These are: Octopus microphthalmus, 

 Cistopus indicus, and Octopus macropus. 



