124 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



After the description of O. moniliformis and O. placida I added 

 in the same work ('04, p. 138) : 



O. placida occupies with 0. moniliformis a place apart in the genus Ophio- 

 initrcUd ; . . . they can not be assigned to the genus Ophiomitrella except with 

 the reservation which I made on page 123 on the subject of the adoral plates. 



The scruples which I had in 1914 regarding the generic separation 

 of these two species from the other species of Ophiomitrella have 

 no longer any force, for the species are becoming more and more 

 numerous, and the necessity has arisen for circumscribing more 

 closely the characters of the species in order to reassign them to 

 genera with more exact limits. I believe, therefore, that it is neces- 

 sary to establish a new genus for Ophiomitrella placida and O. mon- 

 Uiformis, and I believe that Ophiomitra microphylax H. L. Clark 

 must also be included in it. This genus, to which I propose to give 

 the name of Ophiomelina, would be characterized by having the 

 adoral plates elongated into a distal lobe separating the mouth 

 shield from the first side arm plate, by having the upper arm plates 

 large, in contact at the base of the arms, and by having the elongated, 

 fine, more or less numerous arm spines restricted to the sides of the 

 arms. I will come back to it again shortly. 



I thus propose to leave in the genus Ophiophthalmus only the 

 seven following species : 



O. cataleimmoida (H. L. Clark). 



O. normani (Lyman). 



0. (jraniferus (Liitken and Mortensen ) . 



O. rclictus (Kcehler). 



0. eurypomus (H. L. Clark). 



0. hylacanthus (H. L. Clark). 



0. codonomorphus (H. L. Clark). 



Of the different species which Matsumoto has placed in his genus 

 Ophiophthalmus, two occur in the Albatross collection ; the one which 

 should be retained in this genus is O. relictus (Kcehler) ; the other 

 is made the type of the genus Ophiomelina' this is O. placida 

 (Koehler). I shall discuss these below. I shall also place in the 

 genus Ophiophthalmus, though with some doubts, a new species col- 

 lected by the Albatross and represented by a single specimen. 



OPHIOPHTHALMUS RELICTUS (Kwhler). 



Plate 9, figs. 1-4 ; plate 95, fig. 3. 



Ophiacantha reUota K<EHLER ('04), p. 106, pi. 17, figs. 4-6. H. L. CLARK 



('15), p. 204. 



Ophiacantha oedidisca H. L. CLARK ('11), p. 219, fig. 101; ('15), p. 203. 

 Ophiophthalmus relictus MATSUMOTO ('17), p. 106. 

 Ophiosemnotes oedidisca MATSUMOTO ('17), p. 137. 



Localities. Albatross station 5618; Molucca Passage; March 

 Island bearing S. 69 E., 14.45 kilometers (7.8 miles) distant (lat. 



