1889.] MR. F. E. BEDDARD ON ^OLOSOMA TENEBRARUM. 51 



as it was unknown to the fishermen, Capt. Macdonald fortunately 

 preserved it. Through the kindness of Lieut.-Colonel W. Gostwyck- 

 Gard the well-preserved skin found its way to me for identification, 

 and the following diagnosis of the species is taken from it : — 



D.7I3V. A.2|J^. 



The shape of the fish is that of a Horse-Mackarel, but it is fuller, 

 reminding one of a Pilot-fish, which it also resembles in tjie small size 

 of its scales. The mouth is rather wide, the maxillary extending to 

 the hind margin of the eye ; both jaws are armed with a series of 

 rather strong teeth, distantly placed. The dorsal spines are short 

 and feeble, the anterior dorsal and anal rays forming a distinct lobe. 

 Caudal deeply forked. Upper parts of a greenish-black hue, lower 

 parts silvery, these two colours forming, where they meet, deep 

 indentations by which they are dove-tailed into each other. 



By this peculiar coloration the fish can be recognized at a glance. 

 Like other species of Lichia, it feeds chiefly on fishes of the Herring 

 family, and the specimen here described was no doubt in pursuit of 

 its prey at the time of its capture. 



6. Note upon the Green Cells iu the Integument of 

 jEolosoma tenebrarum. By Frank E. Beddard^ M.A., 

 F.Z.S. 



[Keceived February 5, 1889.] 



(Plate V.) 



This Worm has been described by Vejdovsky (' Thierische Oi-gau- 

 ismen der Brnunenwiisser von Prag ' (Prag, 1882), p. 61, and also 

 • System uud Morphologie der Ohgochaeten' (Prag, 1 884), p. 21)' as 

 new, but it may possibly be identical witli Nais aurigena of Eichwald 

 (" Erster Nachtrag zur Infusorienkunde Russlands," Bull. Soc. 

 Imp. Nat. Moscou, t. xx. 1847, p. 359). It has appeared lately 

 in great uumbers in a tank at the Society's Gardens, near to that 

 which produced a new species, ^olosoma headlexji (see my paper 

 " Observations upon an Annelid of the Genus JEolosoma" Proc. Zool. 



1 An American naturalist, Mr. F. W. Cragin, has recently described two 

 species of JEolosoiua (•' First Contribution to a Knowledge of the Lower Inver- 

 tebrates of Kansiis," Bull. Washbourn College Lab. 1887, no. 8, p. 31), and as 

 the periodical is perhaps not generally accessible, I take this opportunity of 

 calling the attention of systematists to the paper. The first species is named 

 JE. stokcsl, but 1 cannot discover any characters by which it can be differentiated 

 from JE. quatcrnarium or M. ehrenbcrgu. The chief points in the description 

 are as follows : — " Body cylindrical .... with eight articulations ornamented 

 with bright salmon-red nuclei .... most numerous near extremities ; setal 

 fascicles in four rows .... each fascicle .... with four or five unequal simple 

 bundles." 



The second species, M. leidyi, appears to be new and to be a near ally of 

 M. tcnehranmi. It has " pale olive-gi-een nuclei," and possesses "sigmoid spine- 

 like setse " in all the seta-bundles ; in the posterior segments the fascicles are 

 composed entirely of these setse. In M. tenebrarum, as stated above, these 

 setffi are only found in the posterior bundles. 



