156 U.S. NATIONAL MUSEUM BULLETIN 23 4 



A small semicoiled, sharply pointed penis is on the left side at the 

 base of the gUls. 



Measurements and indices of a male specimen of Bathothauma 

 lyromma Chun are: 



Type. — Zoologisches Museum, Berlin. 



Type Locality. — West of Cape Verde, west Africa. 



Discussion. — This curious specimen is placed, with some hesita- 

 tion, in Chun's Bathothauma lyromma inasmuch as it appears to 

 share a number of characters with that species. Unfortunately, Chun 

 gave no description of his species with the exception of a detailed 

 comparison of the eyes; the only description available is that of 

 Pfeffer which he took from Chun's excellent illustrations. Chun's 

 specimen was, according to the illustration, about 65.0 mm. in man- 

 tle length and came from off Cape Verde. Hoyle examined another 

 specimen taken by the Albatross in the eastern Pacific, but this was 

 even smaller. The most distinguishing features of this species seem 

 to be the rounded mantle end with the separate small fins, the pecul- 

 iar shape of the mantle, and the eyes and their stalks. Even these 

 may change with growth and, inasmuch as the present specimen is 

 nearly twice as long as the largest previously known specimen, it is 

 considered that the discrepancies noted are due to growth and 

 maturity. 



Distribution.— West of Cape Verde 0-3000 m. (Chun); 36°05'30" 

 N., 9°30" W., 0-3660 m. (Joubin); off Bermuda (Voss); eastern 

 Pacific (Hoyle); Philippines. 



Order Octopoda: Suborder Incirrata 

 Family Bolitaenidae 



Japetella diaphana Hoyle, 1885 



Figure 35 



Japetella diaphana Hoyle, 1885b, p. 232. — Thore, 1949, p. 4. 



Eledonella diaphana, Hoyle, 1886, p. 107. 



Bolilaena diaphana, Chun, 1911, p. 15. 



Chunella diaphana, Sasaki, 1920, p. 171; 1929, p. 14. 



Material.— 1 9, ML 35.0 mm., Sta. D5184, 11.25 miles off 

 Lusaran Light, 1,034 m., Mar. 30, 1908. 1 9, ML 48.0 mm., Sta. 



