156 Pub. Puget Sound Biol. Sta. Vol. 2, No. 44 



naeopodidae, comes to the conclusion that the eye in this whole family is 

 extremely rudimentary in character. My own studies on the eye of 

 Salmincola edrcardsii do not bear out Wilson's assertions. Here the eye 

 occupies a median position slightly below the center of the cephalon (Fig. 

 1, e). It is a tripartite organ (Fig. 18, e) whose structure is practically 

 the same as that of the eye of the free-living marine copepod Eucalanus 

 elongatus Dana, as described by Esterly (1908). For a complete de- 

 scription of the eye of Salmincola edwardsii see Fasten, 1916. 



h. The attachment filament (Fig. 1, a. f.) plays a very important 

 role in the attachment of the copepod to its host. It is located medianally 

 at the anterior end of the cephalon, beneath the thin chitinous body wall. 

 Its position and make-up can be seen to good advantage when a side view 

 of the animal is studied (Fig. 22). It is then seen to consist of three 

 parts: (1), a broad, ball-like bulla (Fig. 22, bu) situated immediately 

 under the thin anterior margin of the cephalon; (2), a tube structure 

 (Fig. 22, t), which makes its way backward from the posterior part of 

 the bulla as far as the eye, and then coils upward in a single loop until 

 it reaches the level of the commencement of the tube, where it enlarges 

 into (3), a broad foot (Fig. 22, ft) which is attached to the frontal margin 

 of the cephalon. The attachment filament secretes a transparent, viscid, 

 glue-like substance that refracts light strongly. When this secretion comes 

 in contact with fixatives containing corrosive-sublimate it coagulates and 

 becomes darkly granular in appearance. In sections treated with Heid- 

 enhain's haematoxylin (Figs. 15, bu; Figs. 16 and 17, a. f ; Fig. 25, bu 

 end ft) it stains intensely black. 



c. The glands which can be distinguished in the free-swimming larval 

 form are as follows : the single frontal gland, the first and second pairs 

 of antennary glands, the pair of shell glands and the pair of maxillipedal 

 glands. All of these glands occupy the cephalon and are well developed. 



The frontal gland (Figs. 16, 17 and 25, f. g), surrounds the entire 

 tube of the attachment filament. It is quite a prominent structure, but 

 most of it lies toward the ventral surface of the organism, between the 

 oesophagus and the attachment filament. This is plainly seen in Fig. 

 17, f. g. 



The glands of the first (Fig. 25, a'. g)and second (Fig. 11, a", g) 

 antennae are located, respectively, on either side of the ventral portion of 

 the copepod below the first and second antennae. The primary antennary 

 glands are somewhat smaller than those leading to the second antennae. 



The shell glands (Figs. 11 and 17, s. g) and the maxillipedal glands 

 (Figs. 11 and 18, mxp. g) are the most conspicuous glands found in the 

 head; the former being about twice the size of the latter. Each shell 

 gland originates dorsally a little above the lower portion of the second 



