76 IOWA STUDIES IN NATURAL HISTORY 
The specimens de Man" and Coutiére 1 identify with Bate’s 
malleodigitus and microstylus already referred to, are figured 
as showing small rostral points or projections; however, Cou- 
tiére did have three specimens of the latter species with the 
emarginate front described by Bate as typical, Coutiére thinks 
the latter anomalous in view of their limited occurrence in his 
material; in the thirty odd specimens of C. rathbune there are 
none with other than the emarginate front. 
The ovigerous female, designated as the type is smaller than 
the dissected, figured specimen: the carapace is 5 mm. long, the 
abdomen and telson 11, telson 2.5; the large hand is 6.2 mm. 
long and 2.3 mm. wide; the small hand 4.2 mm. and its movable 
finger measured from the articulation to the tip 1.75 mm. long. 
C. baculifer Coutiére’® is the only other species of the obeso- 
manus sub-group having the meri of the third legs unarmed, 
these joints are three and six-tenths times as long as wide at 
the middle; the second joint of the second legs is little longer 
than the first, and about as long as the third and fourth to- 
gether, the third is very little shorter than the fourth, which 
is subequal to the fifth; the cylindrical large hand is five and 
a half times as long as wide; and the median joint of the an- 
tennular peduncle is one and one-half times as long as either 
of the other two. 
Crangon arnullatus (Milne-Edwards) 
Alpheus armillatus Milne-Edwards, Hist. Nat. Crust., II (1837), p. 354. 
Zimmer, Zool. Jahrb., Suppl. 11, hft. 3, (1912), p. 401, text figs. 
K1-T1, 
Alpheus heterochelis Rathbun, Bull. U. 8. Fish Comm., XX, pt. 2, 1900 
(90D) ppalOm a (pars): 
Alpheus armillatus or Crangon armillatus Verrill, Trans. Conn. Acad. Sci., 
XXVI (1922), p. 73, text figs. 5a, 6b; pl. 20, fig. 4b; pl. 21, figs. 
4, 4a; pl. 23, fig. 4; pl. 26, figs. 1-1d; pl. 27, figs. 1-1s, and synonymy. 
Pelican Island, shallow; one specimen. Pelican Island, tide 
pool; one specimen. Pelican Island, tide pool, May 11; 6 (3 
ovig.). Pillars of Hercules, English Harbor, 4; one specimen. 
Pillars of Hercules, English Harbor; 3 (1 ovig.). 
11 Op. cit., pp. 347 and 344, and pl. 14, figs. 70 and 68, respectively. 
12 Fauna Maldive and Laccadive Archipelagoes, II, pt. 4 (1905), p. 
886, pl. 77, fig. 25, and p. 884, pl. 76, fig. 23, respectively. 
13 Bull. Soc. Philom. (9), X (1908), p. 206 [16]; see also de Man 
op. cit., p. 314. 
