OPHIOMYXA. 



177 



the angular form of the upper arm-plates readily distinguish it from 

 these latter, which have the plates considerably curved. 



LIST OF SPECIMENS. 



Catalogue Orijriiial Number 

 NunilK:r. Number, of Sik;c. 



Locality. 



When 



Collected. 



Whence obtained. 



Nature of 

 S|)ecimeu. 



383 



384 

 385 



Museum of Comparative Zoology. 



Society Islands. 

 Society Isl^.ntls. 

 Zanzibar ? 



A. Garrett. 

 A. Garrett. 

 Salem Norm. School. 



Alcoholic. 



OPHIOMYXA Mull. & Trosch. 



Type of the Genus, 0. pentagona Miill. & Trosch. 



Disk and arms Avholly covered with a thick, naked skin. No tooth- 

 papilla}. Mouth-papilla3 and teeth in the form of flattened lobes, Avith 

 saw-like cutting edges. Arm-spines stout, bulging at the base, thorny 

 at the point, covered round the base with thick skin ; near the tip of 

 the arm, the lower arm-spine has hooks along its edge. Arms rounded ; 

 arm-plates imperfectly developed. No tentacle-scales. Two genital 

 sUts, beginning outside the mouth-shield. 



SPECIES HEREIN DESCRIBED. 



Ophiomyxa Jlaccida. 

 Ophiomyxa pentagona. 



23 



