218 Bulletin Vanderbilt Marine Museum, Vol. VI 



Genus: AEGATHOA Dana 

 Aegathoa macrophthalma Dana 



Plate 64 



Type: Dana was uncertain of the exact locality of his type 

 material, which he cited as "from Nassau Bay ( ?) , Rio Janeiro 

 (?)." It is deposited in the Philadelphia Academy of Natural 

 Sciences. 



Distribution : In addition to the above questioned localities, 

 this species has been recorded by the "Siboga" from two stations 

 in the East Indian region, namely : Station 16, in Plankton, from 

 the south coast of Kangeang (6° 59' S.— 115° 24' 7" E.) ; Station 

 136, Ternate, in 23 meters depth. The "Alva" specimens from 

 Muntok add another East Indian record. 



Material examined : Three small specimens, taken in jelly- 

 fish, Muntok, Banka Island, Banka Straits, Dutch East Indies, 

 November 5, 1931. 



Technical description: Head: This is two and one-third 

 times as long as the first thoracic segment and about one-fourth 

 wider across the posterior margin than long ; roughly triangular 

 with the median front a widely rounded process extending above 

 and in advance of the antennal bases. Lateral margin notched 

 slightly in advance of the eye and free beyond the antennal socket. 

 Postlateral margins faintly trisinuate. Eyes large, elongate, dorso- 

 lateral in position ; ocelli coarse ; eyes separated from each other 

 by a narrow, hourglass-shape space, which is slightly narrower 

 at its widest point than the diameter of one eye. The first antennae 

 are the thicker and consist of eight articles, extending almost 

 to the postlateral angle of the first segment. The second antennae 

 are distinctly slenderer, also composed of eight articles, with the 

 first peduncular article thicker than those succeeding ; articles two, 

 three and four are longish, while articles five to seven, inclusive, are 

 shorter and tapered distally, the eighth segment extending quite 

 to the tip of the postlateral angle of the first thoracic segm.ent. 

 The second antennae exceed the length of the first antennae by 

 the length of the eighth article of the second antennae. 



Thorax: The first thoracic segment does not surround the 

 head ; is about two-fifths as long in the median line as the head ; 

 the second and third segments are subequal, each being slightly 

 shorter than the first segment. The postlateral margins of the 



