338 BvXletin Vanderbilt Marine Mitseum, Vol. VII 



Length of siphon on ventral side 3 



Transverse greatest width of fins 6 



Length of fins, at insertion 4.2 



Length of fourth, or ventral, pair of arms 8 



Length of third pair of arms 7.7 



Length of second pair of arms 6.2 



Length of first, or dorsal, pair of arms 4.9 



The chromatophores are numerous, large, arranged in approx- 

 imate longitudinal series on the mantle, siphon, the proximal por- 

 tions of the central surface of the arms and are even more 

 numerous on the ventral surface of the head. 



The left eye (viewed ventrally) is somewhat extruded from 

 the normal position, shows four of the five large light organs also 

 greatly dilated. The right eye shows all five light organs in 

 normal position. 



The large suckers of the tentacular arms have the horny rings 

 set with a continuous series of acute triangular teeth, separated 

 by reversed narrow triangular spaces. The majority of the smaller 

 suckers are seen to be similarly dentate, when placed under high 

 magnification. 



Two very young stages of Abraliopsis morisii were taken in 

 the same haul as the preceding specimen, in Flores Strait. These 

 are similar to the young stages figured by Dr. Chun in plate 7, 

 figures 9 and 12, loc. cit., but both of the present specimens repre- 

 sent a slightly younger larval stage, possibly the first post-egg 

 stage, as in the smaller specimen the impress of the embryonic 

 folding of the larva is retained, as well as the remnants of the 

 egg-sac. The larger specimen also has this in less degree. Each 

 has the characteristic series of five light organs present in the 

 ventral orbital area. The mantle and head is covered with promi- 

 nent chromatophores. The ventral pair of arms have the free 

 ribbon-like external webbing folded over ventrally, close to the 

 margin of the siphon. 



The larger specimen measures : Mantle length, 4 millimeters ; 

 head to base of the dorsal arm, 1 millimeter; median width, 2 

 millimeters ; length of arms : ventral, of first pair, 1.4 millimeters ; 

 second pair, 3.0 millimeters; third pair, 2.0 millimeters, and 

 fourth, or dorsal, pair, about 1.5 millimeters. 



