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BULLETIN OF THE UNITED STATES FISH COMMISSION. 
behind, and the lateral one ending in spines at the anterior lateral angles; posterior lateral margin 
angled; the lateral margin of the fifth thoracic segment produced into a strongly sickle-shaped acute 
spine; of the sixth and seventh obliquely truncated and very acute; 8 prominent carinse on the 
abdominal segments, all ending in spines except the submedian of the first 4 segments; a low crest on 
the telson, ending in a small spine, a post-anal keel without a spine, the dorsal and ventral surfaces of 
the telson marked by numerous curved lines of very fine pits, 6 marginal spines, and 4 to 6 submedian 
denticles, 10 to 13 intermediate, and 1 lateral one; the crest and dorsal margin of the telson very much 
thickened in the male; the marginal thickening being continuous between the intermediate spines. 
Remarks . — This species stands in an intermediate position between two Pacific forms, S. panamerisis 
Bigelow and /S', biformis Bigelow, from both of which it may be distinguished most easily by the char- 
acter of the thickening of the telson in the males. This feature, as well as the number of denticles, 
serves also to distinguish full-grown specimens from the nearest Atlantic form, S. empusa Say. The 
latter has 3 to 5 submedian denticles, 6 to 10 intermediate, and 1 lateral one; and never has any 
thickening of the carinse on the abdomen or of the margin of the telson, either in males or females. 
In the Porto Rico collection there are 4 young males, the largest 5.55 cm. and the shortest 
2.25 cm. in length, which seem to be S. intermedia, although they differ from the type specimens in 
some particulars. The antennary scales are only one-half instead of three-quarters the length of the 
carapace; the margins of the sixth and seventh thoracic segments (the second and third exposed 
ones) are not acute, but rounded at the apex, and bear an anterior lobe well marked in the sixth and 
minute in the seventh; in 3 of the specimens the marginal carinse of the first and second abdominal 
segments are the only ones on those segments that bear spines; the denticles on the telson are 3-4, 
8-9, 1; and the expedite of the uropod bears 9 mobile spines. In the largest one of these specimens 
there are, however, thickenings of the margin of the telson that suggest the beginnings of the 
structure characteristic of the type. When we remember that this species was described from only 
two specimens, a male and a female, and that the specimens under consideration are evidently 
immature, it would seem better to regard them as all of one species, pending further study of the 
fully adult form and the younger stages. 
Size . — The largest of the type specimens was 10.5 cm. in length. 
Locality . — Gulf of Mexico and tropical Atlantic. The specimens collected by the Fish Hawk 
were all taken in Mayaguez Harbor with the beam trawl, at 7\ to 18 fathoms, on a mud bottom. 
Life history. — Unknown. 
THE MORE IMPORTANT LITERATURE ON STOMATOPODA. 
Bigelow, R. P., ’94. Report upon the Crustacea of the order Stomatopoda collected by the steamer 
Albatross between 1885 and 1891, and on other specimens in the U. S. National Museum. Proc. 
U. S. Nat. Mus., xvn, pp. 489-550. 1894. 
Bokrajdaile, ’98. On some crustaceans from the South Pacific. Part 1. Stomatopoda. Proc. Zool. 
Soc. Lond. 1898, pt. 1, pp. 32-38, pi. v-vi. 
Brooks, W. K., ’79. The larval stages of Squilla empusa. Johns Hopkins Univ. Studies Biol. Lab., i, 
No. 3, p. 143. 1879. 
Brooks, W. Iv., ’86. Report on the Stomatopoda. Voyage of H. M. S. Challenger. Zool. xvi, n. 1886. 
Brooks, W. Iv., ’92. The habits and metamorphosis of Gonodactylus chiragra. (In Brooks and 
Herrick, The Embryology and Metamorphosis of the Macrura. Mem. Nat. Acad. Sci., v, No. 
4, pp. 352-360. 1892. 
Claus, C., ’71. Die Metamorphose cler Squilliden. Abhandl. d. Gesel. Wiss. Gottingen, xvi, p. 1. 
1871. 
Faxon, W., ’82. Crustacea (Selections from embrvological monographs) Bull. Mus. Comp. Zool. ix, 
No. 1. 1882. 
Gekstaecker, A., ’89. Arthoropoda. Bronn’s Klassen und Ordnungen des Thier-Reichs, Bd. v, Abth. 
n, pp. 686-751, pi. 64-68. 1889. 
Hansen, H. J., ’95. Isopoden, Cumaceen und Stomatopoden der Plankton-Expedition. Erg. d. 
Plankton-Exped. d. Humboldt-Stiftung. Bd. u, G.c. 1895. 
Miers, E. J.,’80. On theSquillidse. Ann. and Mag. Nat. Hist. ser. 5, vol. v, pp. 2-30 and 108-127. 1880. 
Pocock, R. I., ’93. Report upon the stomatopod crustaceans obtained by P. W. Basset-Smith, Esq., 
surgeon R. N., during the cruise in the Australian and China seas of H. M. S. Penguin, Ann. 
and Mag. Nat. Hist. (6), vol. n, 1893, pp. 473-479, pi. xx b. 
