492 



MEMOIRS OF THE UNIVERSITY OF CALIFORNIA 



maximum of contraction and about 1.5 diameters when extended. Long before cytolysis sets 

 in the size of this knob was reduced by a distal sloughing off of its substance which first became 

 limpid clear and then detached itself with adjacent granular plasma. Both before and after 

 this sloughing it was distally somewhat asymmetrical. There is a small articular, distal stylet 

 whose length does not exceed the diameter of the shaft and a central axial retractor fibril, but 

 no marked evidence of eirciilar protractors. 



The ocellus is relatively small. Its length is 0.42 transdiameter and its major axis is deflected 

 about 25° to the left and ventrally from the axis of the body. It projects from the body almost 

 the full length of the lens. The lens is hemispherical, consists of regular, equidistant, concentric 

 laminae and is buried slightly in the black melanosome of the pigment mass. This is sub- 

 hemispherical, being enlarged on its lower outer region. It contains a coral-red core. 



• 



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Fig. TT. Erythropsis extritdens sp. nov. 1. View of the right side with tentacle fully extended. 2. Left 

 side, tentacle retracted. 3. Anteroventral view of moribund individual showing granular stump of amputated 

 tentacle and structure of epicone with girdle and paradinial lines. 4. Ocellus shortly before cytolysis, showing 

 modifications of concentric lines in the lens. 5. Ocellus shortly after cytolysis of cell body, showing zone of 

 solution about the distended lens. 6. Bounding up of detached lens, red core still in melanosome. 7. Last 

 stages of solution of melanosome and core. 8. Persistent transverse flagellum after cytolysis. X 333. 



The nucleus is ellipsoidal, with major and minor axes of 0.57 and 0.40 transdiameters 

 respectively. It lies obliquely in the right anterior part of the body. The chromatin network 

 was not visible. The anterior pusule arises at the anterior flagellar pore, passes posteriorly 

 obliquely across the level of the girdle, where it expands somewhat and is continued obliquely 

 posteriorly to an opening at the right side of the tentacular chamber, at a point which may 

 correspond to the posterior flagellar pore. The two pusules are thus in this individual con- 

 nected in a continuous canal. Several refractive oil granules lie in the plasma adjacent to the 

 sulcus, and a small food remnant lies near the nucleus. Peripheral vacuoles of circular to linear 

 form and minute size filled with a bluish-green fluid lie in the peripheral plasma. The general 

 color tone of the plasma is a pearl grey. 



Dimensions. — Total length, 104m ; of extended tentacle, 240/* ; of ocellus, 33/^ ; 

 ti'ansdianieter, 81/* ; diameters of nucleus, 42^ and 34/*. 



OccursBENCE. — Three individuals taken in collections made with a net of 

 No. 25 silk from a depth of 80 meters, 6, 4, and 0.75 miles oif La Jolla, California, 



