140 



Transactions. 



Fam. LYCOTEUTHIDAE n. n. 



Thaximatolampadidae Chun, 1903, p. 68. Onychoteuthidae subfam. 

 Lycoteuthinae Pfeffer, 1908, p. 294. 



Genus Nematolampas Berry, 1913. 

 Nematolampas Berry, 1913, p. 208. 



A group allied to Lycoteuthis Pfeffer, 1900 {Thaumatolampas Chun, 1903), 

 but with photogenic organs near the tips of the four dorsal arms and along 

 the entire length of the third pair, which are highly modified, their tips 

 being continued as very long and slender filaments devoid of suckers. Of 

 the 5 subocular organs the central organ is conspicuously the largest. There 

 is a pair of photogenic organs at the posterior extremity of the body, situated 

 one on either side just under the fins. As in Lycoteuthis, there are 8 intra - 

 pallial photophores and 2 others of simple structure in the stalk of each 

 tentacle. 



Type. — The following species. 



Nematolampas regalis Berry, 1913. Plate IX, figs. 1 and 2. 

 Nematolampas regalis Berry, 1913, p. 208, fig. 1. 

 Body small, loliginiform ; the mantle thick and fleshy, compressed 

 above and below ; outline cylindro-conic, widest and very slightly flaring 

 anteriorly, tapering more or less gradually to the fins, thence more rapidly 

 to the posterior extremity, which is rounded and conspicuously swollen on 

 either side, due to the presence of a pair of large heavily pigmented photo- 

 genic organs, which have much the appearance of small eyes ; each organ 

 is embedded in a small swelling of tissue snugly lodged in the angle between 



Fig. 1. — Nematolampas regalis : Subocular photophores from right eye of cotype. 

 Freehand sketch from mount in balsam. 



the fin and mantle, but so loosly adherent that it becomes readily dislodged 

 after the fins have been loosened. Anterior mantle-margin with only a 

 very slight angle dorsally, and a somewhat less obscure angle on either side 

 of the funnel. Fins relatively very large, their combined width being about 

 equal to the length of the body, though they are not quite half so long ; 

 anterior margins very thin, only slightly arcuate, and with a conspicuous 

 notch next the body ; posterior margins thicker and nearly straight, the 

 outline of each fin thus forming an elongate (nearly) isosceles triangle, of 

 which the lateral angle of the fin forms the apex. The fins are practically 

 continuous with one another in the median line, at least posteriorly, and 

 are very insecurely attached to the body. 



Head relatively large, short, rounded, flattened above, somewhat exca- 

 vated below. Eyes large and prominent. Ocular apertures large, with 

 a slit-like sinus in front. Bordering the ventral periphery of each eyeball 

 is a conspicuous series of 5 reddish bead-like photogenic organs. Of 



