Boone, Crustacea, Cruises of ''Eagle" and "Ara," 1921-28 29 



Genus : LYSIOSQUILLA Dana. 



Lysiosqullla maculata (Fabricius). 



Plate 3. 



Type: Fabricius' type came from the East Indies and was depos- 

 ited in the British Museum. 



LIaterial EXA MINED: One large specimen from the Florida Keys, 

 March, 1924, taken by the "Ara." 



DiSTEiBUTiON : Circumtropic, abundantly recorded from the Indo- 

 Pacific and less abundantly known from the "West Indian region. Lit- 

 toral zone, burrowing. 



Color : Alternately banded transversely with broad bands of grey- 

 ish black and cream color. 



Technical description: Rostrum widely heart-shaped, one-fourth 

 wider than its greatest length, produced to a median point, with the 

 anterolateral margins rounded. Carapace squarish, with the antero- 

 lateral margins slightly rounded, posterolateral margins slightly pro- 

 duced, convex, median posterior margin concave; dorsal surface 

 smooth except for the two longitudinal submedian grooves. The first 

 and second thoracic segments are almost entirely concealed ; the third 

 segment is shorter and narrower than those following and has its 

 lateral part inconspicuous, appressed to the body; the third, fourth 

 and fifth segments are of equal length but successively increase in 

 width; each segment has the lateral margin convex, anteriorly trun- 

 cate, nearly right-angled posteriorly on the fourth and fifth segments, 

 the sixth being rounded. The first four abdominal segments are sub- 

 equal in length with the lateral margins slightly sinuate; the fifth 

 segment is similar to the fourth, but a little longer and has its pos- 

 terior margin armed with about twelve spinules on each side, the outer 

 ones being the longer ; the sixth segment is only four-fifths as long as 

 the fifth with a distinct, flat, transverse carina across the anterior 

 margin, accentuated on each side but not in the median region by a 

 depression, and with its posterior edge spinulose ; the entire posterior 

 margin of the sixth segment is also spinulose, its lateral margin trun- 

 cated. The telson is wider than long; a spinulose carina across its 

 proximal margin, prominent, elevated, smooth, tongue-like process, 

 which narrows posteriorly, rounded, and terminates subdistally. On 

 either side of this elevation there is a roughened, granulose area, 

 coarsely pitted ; while the outer third of the telson bears an ovate con- 



