74 BULLETIN OF THE 



Meningodora mollis, sp. nov. 



Plate XI. Figs. 8-9. Plate XII. Figs. 5-9. 



Female. — The carapax including the rostrum is about two thirds as long 

 as the abdomen to the tip of the telson, about half as high as long, and con- 

 siderably compressed ; the dorsal carina is high and very sharp in front, 

 gradually diminishes posteriorly, scarcely reaches the posterior margin, and 

 anteriorly extends to the tip of the acutely triangular rostrum, which is about 

 half as long as the antennal scale and only about a seventh as long as the cara- 

 pax. On the dorsal carina just back of the base of the rostrum there are five 

 or six very indistinct rudimentary teeth scarcely perceptible to the naked eye 

 and too minute to be indicated in the figure. The anterior margin projects in 

 a triangular lobe above the base of the antenna, and is armed below with an 

 acute and laterally prominent branchiostegial spine very much as in Miersia 

 Agassizii. From just back of the eye a distinct gastro-antennal and gastro- 

 hepatic carina extends backward and downward and divides, the upper branch 

 continuing back in a gastro- and cardiaco-branchial carina, and the lower turn- 

 ing down in front of the branchial region and limiting a wide antennal and 

 hepatic sulcus behind. The inferior and posterior edges are broadly and evenly 

 curved. 



The eyestalks (PI. XI. fig. 8") scarcely reach the tip of the rostrum, are 

 nearly cylindrical, slightly swollen near the base and tapered distally, with a 

 papilla-like tubercle just back of the cornea on the inner side and very small 

 terminal black eyes no thicker than the adjacent stalk. 



The first segment of the peduncle of the antennula is about as long as the 

 eye and rather longer than the other two taken together, flattened and some- 

 what excavated above and with a rather broad lateral lobe terminating in a 

 tooth nearly as far forward as the extremity of the body of the segment itself ; 

 the second and third segments are subcylindrical and approximately equal, but 

 the third projects below in a process for the articulation of the lower flagellum 

 far beyoaid the base of the upper flagellum. The proximal part of the upper 

 flagellum is much stouter than the lower, somewhat compressed, not conspic- 

 uously swollen at the base, and hairy along the lower edge. The lower flagel- 

 lum is very slender, cylindrical, and nearly naked. The antennal scale is 

 rather more than twice as long as the eye, nearly half as broad as long, very 

 thin, foliaceous, slightly narrowed distally, and obliquely truncated at the tip, 

 which extends a little beyond the small tooth in which the slightly curved 

 outer margin terminates. There are no acute teeth or spiues on the second 

 segment of the peduncle at the base of the scale. 



The oral appendages are all very nearly as in Miersia Agassizii, the diff"er- 

 ences being no greater in fact than might be expected between species belong- 

 ing to the same genus. The labrum is nearly the same, but the lobes of the 

 metastome are much narrower. The mandibles (PI. XIL figs. 5, 5*) are much 

 the same, but the mesial edge of the ventral process is short and armed with 



