1 8 Addison E. Verrlll, 



farthest north (to Beaufort, N. C.), while this form of larva is 

 the most common farther north, but there is no direct evidence of 

 its identity. The earliest stage observed is shown on Plate iiiA., 

 figs. I. 2. In this the antennules (a') have only a rudimentary 

 secondary flagellum and the antennae (a") are short, reaching only 

 to the end of the second antennular segment. 



There is a distinct median ocellus (oc) and the green gland (g) 

 is very distinct. The third maxillipeds are long and very slender 

 and the first four legs (pi. Ill) are fully developed and very long 

 (some are broken off in the figure), but the fifth pair appear only 

 as minute rudiments (pi. IIIA, fig. 2, pv). The abdomen (pi. 

 IIIA, fig. 2, ab) is rudimentary, bud-like, without segments or 

 appendages. 



The next stage, shown on pi. Ill, fig. I, is very similar, but has 

 the antennules and antennae longer and nearly equal in length. 

 The abdomen (pi. IIIA, fig. 2b) is a little more advanced and 

 shows faint segmentation, and the uropods (u) appear as rudi- 

 ments; the telson (f) is distinct, small, and nearly semicircular. 



The last stage observed (pi. Ill, fig. 2 ; pi. IIIA, figs. 3, 3a) 

 has the antennas considerably longer than the antennules ; the fifth 

 pair of legs (pv) have become longer and 2-jointed ; the abdomen 

 is much larger, well segmented, and has four pairs of small 

 pleopods ; the uropods (u) have become much larger, ovate, and 

 longer than the telson (t) which is now longer than wide, subovate, 

 obtuse. The larvae were difficult to keep alive in confinement, 

 with only our conveniences on shipboard. 



Family SCYLLARID^ White. 



Scyllarida White, List Crust. British Mus., 1847. Dana, op. cit., 1852, 

 etc. 



Body wide, depressed more or less ; abdomen most so. Covered 

 with a thick, hard sculptured or tuberculose shell. Eyes situated 

 in orbits formed within the margins of the carapace. Antennae 

 short and broad, with flat, scale-like, stiff segments. Mandibles 

 have a palpus of one joint. None of the legs are chelate except 

 the last pair in the female. Larva is a Phyllosoma. 



Scyllarides Gill. Sea Crawfishes; Spanish Lobsters. 

 Scyllarides Theodore Gill, Science, new ser., vol. vii, p. 98, 1898. Rath- 

 bun, op. cit., 1901, p. 97, etc. 



Scyllarus Dana, op. cit., p. 516, 1852 (not of Fabricius, 1775)- 



