94 MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 



Order Cumacea. 



The species of Leucon, Eudorella, Petalomera, and Eudorellopsis are said by G. O. Sars to be 

 eyeless, and so also are many species of Diastylis, while other species are furnished with a small 

 but well-developed eye. 



[The eyes are inconspicuous in the majority of the species of the order, and their presence or 

 absence is frequently not noted in the descriptions.] 



Order Phyllocarida. 



Nebaliopsis typica G.O.Sara. "Eyes rudimentary, without pigment or visual elements." Southern Ocean, 

 1,375 to 2,550 fathoms. 



Order Schizopoda. 



EUPHAUSIID^E. 



Bentheuphausia amblyops G. O. Sars. Eyes rudimentary, very small, pigment whitish; "no true corneal 

 facets or other visual elements." Atlantic and South Pacific, 1,000 to 1,800 fathoms. 



[I can find no mention of " JEupliausia simplex Will.-Suhm " in Sars's Challenger report, and 

 unfortunately have not Will.-Suhm's papers with me ; but as far as I know Bentheuphausia is the 

 only Euphausiid with rudimentary eyes.] 



MYSID^E. 



Petalophthalmus armiger Will.-Suhm. Eyes thin, oval lamellae, without trace of pigment or visual elements 

 (G. O. Sars). Eye-stalks terminated by concave spherical plates, " but with no trace of any eye-like 

 structure." South Atlantic, 2,500 fathoms. — Will.-Suhm. 



Boreomysis scyphops G. O. Sars. Eyes, lamellar plates " without pigment or visual elements." North Atlantic, 

 South Atlantic, and South Pacific, 1,100 to 1,950 fathoms. 



Amblyops abbreviata G. O. Sars. North Atlantic, 100 to 300 fathoms. 



A. crozettii G. O. Sars. Southern Ocean, 1,600 fathoms. 



Eyes in both species flattened plates without visual elements. 



Pseudomma rosewm G. O. Sars. North Atlantic, 50 to 500 fathoms. 

 P. affine G. O. Sars. North Atlantic, 50 to 500 fathoms. 

 P. truncatum Smith. North Atlantic, 50 to 500 fathoms. 

 P. sarsii G. O. Sars. Off Kerguelen Island, 1,675 fathoms. 

 P. australe G. O. Sars. Off Bass Strait, 33 fathoms. 



Eyes in all the species " broad petaloid expansions of the ocular segment, partially connate 

 m the middle, not exhibiting the slightest trace of pigment or visual elements." 



Mysidella typhlops G. O. Sars. Eyes with conical tips, without pigment or visual elements. North Atlantic, 



150 to 200 fathoms. 

 Pseudomysis abyssi G. O. Sars. Eyes conical, without trace of pigment or visual elements. North Atlantic, 



1,100 to 1,280 fathoms. 



Order Decapoda. 



Calocaris macandrem Bate. 



Bathyplax typhlus A. M.-Edwards. Described as having the eyes very small, immobile, and without cornea. 



West Indies, 400 fathoms. 

 Eryoniscus emeus Bate. Canary Islands, 1,675 fathoms. Eyeless. 

 Phoberus ccecus A. Milne-Ed w. Caribbean Sea, 416 fathoms. ''Eyes rudimentary, without corneas." 



Cymonomus granulatus A. M.-Edw. North Atlantic, fathoms. 



C. quadratus A. M.-Edw. West Indies, 175 to 500 fathoms. Eye-stalks immobile, spiny rods, without a 



cornea. 

 Willemcesia leptodactyla Willem.-Suhm. Atlantic, 1,900 fathoms; Pacific, 1,375 fathoms. 

 W. forceps A. M.-Edw. West Indies, 1,920 fathoms. 



Polycheles typhlops Heller. Mediterranean and North Atlantic, 200 to 250 fathoms. 

 P. crucifer (Will.-Suhm) Bate. West Indies, 450 fathoms. 

 P. helleri Bate. Pacific, 500 to 1,070 fathoms. 

 P. baccatus Bate. Pacific, 310 to 315 fathoms. 



