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° O'. 



B. Setce caudales Mce longlssimm. Frons obkisus, rotundatus. 



Calanus Danai, Lbk. Cephalothorax 6-articulatus, postice obtusus, capite discrete ; seg- 

 mentis tribus penultimis subaequis, postico brevi. Antennae anticse corpore paulo 

 longiores, seta antepenultima postica longissima. Abdomen mediocre, 4-articnlatum. 

 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 tbree, however, all have the anterior antennaj 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. mira- 

 bilis (Trans. Ent. Soc. vol. iv. pi. 5. f. 2), though the arrangement of the hairs is not 

 exactly the same. There are fom- pau'S 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 lamella3 are a little longer than the posterior 

 segment. 



Collected April 27, S a.m. S. lat. 0° 40'; 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- 

 ptomm, — the accessory branch having four small intermediate segments, each with a long 

 seta. The abdomen also is quite unlike that of C. attenuatus and elongatus, next to 

 which this species is placed by Prof. Dana. 

 Of this species there is one specimen, collected on the 7th July, 0° 40' S. lat., and 0° 20' W. long. 



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 specunens 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 setse, 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 lamella? had four long hairs, but the 

 ends were all broken off. Colour slightly pink. 



Collected February 1, 1858. S. lat. 0°; W. long. 0° 30'. 



In Pl. XXIX. fig. 1, two of the secondary setse and a part of one of the large antennary hairs is repre- 

 sented, under a magnifying power of 250. 



