64 LEODICID^ OF THE WEST INDIAN REGION. 



According to his figures, tlie head is much more of a sugar-loaf in form than is the case 

 with my Key West specimen (plate lv, figure 5; plate lx, figure 12), and the tentacles 

 are longer and more slender. As I have stated above, there is considerable variation in 

 the form of the setse, and apparently Mcintosh has chosen to figure one form and I 

 another, for I have seen and described (see above), but not figured, all of the forms he 

 mentions except that I did not find any compound seta with as long a terminal joint as 

 the one he gives in plate lxxxvi, figure 3a. He gives two sets of figures of the jaw, one 

 on plate lxiii, figures 2 and 2a, and the other on plate lxv, figures 11 and llo, and his 

 text references are solely to the latter. Both maxillte and mandibles are very unlike 

 in his two sets of drawings, and while they may be intended to represent jaws from 

 animals of different ages, that is nowhere stated. The maxilla of my Key West speci- 

 men agrees closely with the one Mcintosh figures in plate lxtii, figure 2, except that he 

 represents an unsymmetrical arrangement of the teeth in the left proximal plate which did 

 not appear in my material. The angle between the halves of the mandible is less in his 

 figure (plate LXiit, figure 2a) than in mine, but these differences seem not of specific 

 importance. He describes the gills as begianing on the fourteenth parapodium and states 

 that there are 20 to 25 pairs. These again seem to be matters of individual variation. 



I have also compared the Florida specimen with some purchased from the Marine 

 Biological Laboratory at Plymouth, England. In these, the gills began on the seven- 

 teenth setigerous somite and extended through 25 somites. The gills had more fila- 

 ments than the Key West specimen, and the jaws were larger and with more teeth on the 

 plates. As the Plymouth specimens were much larger than was the one from Florida, 

 these are evidently matters dependent on age and not specific in character. 



In all of the figures I have seen of this species it is represented as without eyes, and, 

 as stated above, Ehlers definitely gives this as one of the characteristics of his Florida 

 specimen. I have examined Ehlers's specimen in the Museum of Comparative Zoology 

 at Cambridge with reference to this point, but find that it has been dried and that it is 

 not possible to see whether eyes are present or not. In the rest of the literature I find 

 no reference to eyes, but I can find no indication of these organs in the Plymouth speci- 

 mens. Since the presence or absence of eyes does not in itself seem to me of specific 

 importance, I have regarded this as merely a varietal difference. 



Marphysa viridis Treadwell. 



(Plate 6, figures 1 to 4; text-figures 212 to 223.) 

 Marphysa viridis Treadwell, 1917, p. 264, plate 2, figures 13-18; plate 3, figures 1 and 2. 



A rather small species of this genus, the type specimen, after preservation, and much 

 contracted, measured 100 mm. in length, 2.5 mm. wide at the peristomium; it contains 

 about 200 somites. In life, the prostomium and first somite are of a decidedly greenish 

 tint (not adequately shown by the artist in the figure) and very iridescent, while the 

 remainder of the body is flesh-color, in places distinctly red because of the contained 

 blood (plate 6, figures 1-4). There are numerous yellow spots on the dorsal surface of 

 the anterior somites. Preserved material shows a pronounced iridescence as far back 

 as the ninth somite, while the remainder of the body is uniform grayish brown. 



The prostomium is distinctly bilobed and the tentacles rather long, colorless, pointed 

 at the apex, and extend as far back as the third somite (plate 6, figure 2). There are two 

 pairs of anal cirri, one being much larger than the other (plate 6, figure 4). 



The peristomium is about as long as the prostomium, a little wider on the posterior 

 than on the anterior margin, and about twice as long as the second somite (plate 6, 

 figure 2). The succeeding somites are practically uniform in width and length until they 

 narrow toward the posterior end. 



