18 V.S. NATIONAL MUSEUM BULLETIN 234 



Three distinct rows of photophores on ventral arms and in addition a row 

 of 4 to 9 light organs between ventral and median row and 1 or 2 

 scattered organs between median and dorsal row. A solitary large white 

 photophore within funnel groove at base of first nuchal fold. 



Abralia sparcki (p. 112) 



31. Hooks present on arms; fins not united posteriorly, but with end of mantle 



projecting beyond fins; tentacles absent in juveniles and adults. 



Octopoteuthis sicula (p. 116) 



Hooks absent on arms; fins united posteriorly; tentacles present in juveniles 



and adults 32 



32. Mantle-funnel locking apparatus well developed, forming a distinct ± ; 



animals muscular, active 36 



Mantle-locking apparatus straight or ear-shaped; if ear-shaped, animals 

 soft, choroidal; bathypelagic 33 



33. Mantle-funnel locking apparatus a simple groove and corresponding ridge . 34 

 Mantle-funnel locking apparatus ear-shaped 37 



34. Animal strong, muscular; fins terminal, rhombic; a double row of prominent 



large hooks on tentacular club; no light organs on surface of head, mantle, 



and arms Onychoteuthis banksi (p. 117) 



Animal choroidal, soft, flabby; fins terminal, round; no hooks on tentacular 

 club; numerous light organs on mantle, head, and arms 35 



35. Light organs on mantle, head, and arms numerous but scattered; three 



rows of light organs on IV, two rows on I, II, and III. 



Calliteuthis celetaria pacifica (p. 119) 



Light organs on mantle, head, and arms very numerous, closely set; eight 



or nine rows of light organs on IV; three or four rows on arms I, II, and 



III Calliteuthis meleagroteuthis (p. 123) 



36. Mantle-funnel locking apparatus articulating by grooves and ridges. 



Nototodarus sloani philippinensis (p. 128) 



Mantle-funnel locking apparatus fused on one or both sides, but strong 



grooves and ridges present . . Symplectoteuthis oualaniensis (p. 134) 



37. Tentacular club with four rows of suckers on hand part. 



Chiroteuthis iiriperator (p. 136) 

 Tentacular club with about 20 rows of suckers. 



Mastigoteiithis cordiformis (p. 140) 



38. A line of cartilage-bearing tubercles in dorsal midline, and a A-shaped line 



on each side of funnel at point of fusion with mantle 39 



No line of cartilage-bearing tubercles, either dorsally or ventrally . . . . 40 



39. Mantle inflated, barrel-shaped; surface of mantle and fins covered with 



numerous close-set cartilaginous tubercles . . Cranchia scabra (p. 142) 

 Mantle elongate; no tubercles on surface of mantle or fins. 



Liocranchia reinhardti (p. 145) 



40. Mantle and fins drawn out into a long narrow tail; eyes sessile, not on stalks; 



head sessile Taonius pavo (p. 150) 



Mantle rounded posteriorly with small, paddlehke fins; eyes stalked; 

 head stalked; transparent Bathothauma lyromma (p. 153) 



41. Animals small, gelatinous, semitransparent; bathypelagic 42 



Animals small to large, muscular; surface or bottom dwelling 43 



42. Optic nerve short; eyes lateral; male without a hectocotylus; suckers in 



contact and crowded Eledonella pygmaea (p. 158) 



Optic nerve long; eyes lateral; male with a hectocotylus; suckers small, 

 urn-shaped, widely spread, one or two sucker diameters apart. 



Japetella diaphana (p. 156) 



