212 Mr. F. S. Conant on the Ghcetognaths. 



large salmon- or orange-coloured form mentioned in the same 

 article is the species next described. 



2. Spadella viaxima, sp. n. 



Specimens of this and the two following species were given 

 me by Professor Verrill from the ' Albatross ' material in his 

 possession, and I am indebted also to Dr. G. Brown Goode, 

 of the National Museum, for permission to include them in 

 this list. 



Spadella maxima is an unusually large and stout Chaeto- 

 gnath, 52 millim. long and 5 raillim. wide. Its one pair of 

 lateral fins extends along the posterior two thirds of the 

 body-segment and tlie anterior third of the caudal segment. 

 According to the classification followed by Strodfcmann, 

 therefore, it would belong to the genus Krohnia. The reasons 

 for including it among the Spadelloi, which otherwise are, 

 without exception, small animals, are found in the note on 

 classification. Seizing-hooks 6. Anterior teeth 3-5. Pos- 

 terior teeth 5-7. The corona could not be made out satis- 

 factorily in the preserved specimens ; it seemed to resemble 

 the pear-shaped form found in S. hexaptera. No diverticula 

 from intestine. Muscles slender in proportion to the breadth 

 of the body, a large lateral area on each side between the 

 dorsal and ventral bands being free from muscle. Epidermis 

 thickened to several layers of cell around the neck. 



The specimens had been in alcohol for some years and were 

 entirely devoid of the " deep salmon- or orange-colour " men- 

 tioned by Professor Verrill as characterizing them from the 

 colourless surface-forms. They were brought up in the trawl- 

 wings at Station 2428 of tlie ' Albatross,' in the North 

 Atlantic, lat. N. 42° 48', long. W. 50° 55' 30". 



3. Krohnia hamata (Mobius). 



Chsetognaths evidently belonging to this species were taken 

 in the trawl-wings at Station 2045, off Martha's Vineyard. 

 They have one pair of very delicate lateral fins, hooks bent 

 sharply at the tips, anterior teeth wanting, and a very large 

 number of posterior teeth — all of which are characteristic of 

 K. hamata. But they offer one unusual variation in the 

 possession of a well-marked ventral sheet of transverse muscle, 

 such as in Grassi's classification is characteristic of his genus 

 Sagitta {Spadella of the others). It extends from the 

 beginning of the neck as far back as the posterior edge of the 

 abdominal ganglion. 



