178 MR. LUBBOCK ON SOME OCEANIC ENTOMOSTRACA 
Collected May 3. S. lat. 0° 40' ; W. long. 0° 20'. 
October 7. S. lat. 7° 15'; W. long. 27° 52'. 
November 22. S. lat. 40° 53' ; E. long. 45° 22'. 
November 30. S. lat. 34° 43'; E. long. 77° 0'. 
a 
}f 
B. Setce caudales 2da? longissi/mce. From obtusus, rotundatus. 
Calanus Danai, Lbk. Cephalothorax 6-articulatus, postice obtusus, capite discreto ; seg- 
mentis tribus penultiiuis subaequis, postico brevi. Antennae anticae corpore paulo 
longiores, seta antepenultima postica longissima. Abdomen mediocre, 4-articulatum 
Styli caudales breves, setis secundis longissimis. 
Tbis species is nearly allied to tbe tbree last described by Dana, namely, C. gracilis, 
elongatus, and attenuatus. These three, however, all have the anterior antennae much 
longer than the body, and the cephalothoracic segments four or five in number, and are 
altogether longer and slenderer. The second pair of antennae resemble those of C. mirar 
bilis (Trans. Ent. Soc. vol. iv. pi. 5. f. 2), though the arrangement of the hairs is not 
exactly the same. There are four pairs of natatory feet. PL XXIX. fig. 2 represents a 
leg of the fifth pair, which is somewhat peculiar. The second segment of the abdomen 
is larger than the other three. The caudal lamellae are a little longer than the posterior 
segment. 
Collected April 27, 8 a.m. S . lat. 0° 40 7 ; W. long. 0° 20'. 
Pl. XXIX. fig. 2. posterior leg, x 30 ; fig. 3. end of anterior antenna, x 30. 
Calanus gracilis, Dana. 
The second pair of antennae in my specimen do not resemble those of Calanus attenu- 
atus, nor are they formed upon the type usual in Calanus, but resemble those of Dia- 
ptomus, — the accessory branch having four small intermediate segments, each with a long 
seta. The abdomen also is quite unlike that of C. attenuatus and elongatas, next to 
which this species is placed by Prof. Dana. 
7th Julv, 0° 40' S. lat., and 0° 20' W 
Calanus mirabilis, Lbk. 
This species was described by me in the • Transactions of the Entomological Society of 
London,' vol. iv. pt. 2. p. 10. My specimens wanted the terminal segment of the anterior 
antenna. This segment bears a short plumose hair in the middle, and four beautiful 
dark-red setae, three of which are of considerable size, and two are beautifully plumose. 
None of them, however, are so large as the two posterior subapical setae, which are nearly- 
equal in size. In the present specimens the cephalothorax was 6-jointed, the head being 
separate ; the separation of the two last cephalothoracic segments was indistinct, and they 
were smaller than the two preceding. The caudal lamellae had four long hairs, but the 
ends were all broken off. C olour slightly pink. 
Collected February 1, 1858. S. lat. 0°; W. long. 0° 3&. 
In Pl. XXIX. fig. 1, two of the secondary setae and a part of one of the large antennary hairs is repre- 
sented, under a magnifying power of 250. 
i 
