April 11, 1902.] 



SCIENCE. 



576 



by irregularities of the surface of the 

 water. Such images are small black spots, 

 orange or yellow bordered. 



3. It was pointed out that in the male 

 of Eupomotis gihbosus the colors are much 

 brighter than in the female. The ver- 

 micular markings on the cheeks of the male 

 are more brilliant than those of the female ; 

 the opercular ear-flap is larger and bor- 

 dered with scarlet and blue; the ventrals 

 of the male are black, while those of the 

 female are yellow; the dorsal and caudal 

 of the male are much more brilliantly blue 

 than those of the female. In approaching 

 the female, in order to induce her to enter 

 his nest to spawn, the male elevates or 

 puffs out the gill covers so as to display 

 their brilliant markings. At the same 

 time the opercular ear-flaps are erected 

 and the black ventral fins spread out. 

 When in this attitude the male faces the 

 female and it is when seen from the front 

 that his display of color is most brilliant. 

 He assumes a similar attitude when threat- 

 ening other males. He was never seen to 

 assume this attitude except under the cir- 

 cumstances described, so that the display 

 of color resulting from the attitude must 

 be regarded as a means of expressing the 

 emotions. 



The Early History of the Lateral Line and 



Auditory Anlages in Amia: Cora J. 



Beckwith. Presented by Jacob Reig- 



hard. 



No common anlage of the auditory pit 

 and lateral line system, such as has been 

 described in Teleosts by Wilson, was 

 found in Amia. The auditory pit was 

 found to arise much earlier than the lateral 

 line system and in the usual way. It is at 

 first imbedded in an elongated mass of 

 mesectoblast proliferated from the neural 

 crest. This mass of mesectoblast, with 

 enclosed auditory pit, bears a considerable 

 resemblance to the common anlage of 



auditory pit and lateral line system re- 

 ferred to above. It subsequently extends 

 into the adjacent gill arches, where its 

 further history was not followed. The 

 lateral line system makes its appearance at 

 a later stage in the form of several inde- 

 pendent ridge-like thickenings of the ecto- 

 blast which subsequently fuse. It is at no 

 time connected with the anlage of the audi- 

 tory pit. 



The Vascular System of the Common 

 Squid, Loligo pealii: L. W. Williams. 

 The knowledge of the histology of the 

 vascular system of decapod moUusks is 

 very incomplete, especially in reference to 

 the extent of the capillary system. In 

 addition to the capillaries, lacunge have 

 been believed to intervene between the 

 arteries and veins. The extent of the 

 capillary system was determined by inject- 

 ing the vascular system with Berlin blue, 

 and the lining of the vessels was studied 

 by means of silver impregnations. Both 

 the arterial and branchial hearts seem to 

 lack an endothelium. The branchial heart 

 consists of striated muscle and apparently 

 secretory polygonal cells. The intrinsic 

 muscle of the peristaltically contractile 

 arteries resembles connective tissue. The 

 arteries and veins are connected in all 

 parts of the squid by capillaries. All the 

 vessels are lined by an endothelium. The 

 veins are connected with small end-sinuses 

 which enclose the terminal branches of the 

 arterioles and receive numerous capillaries, 

 some of which arise from the perforating 

 arteriole. The so-called lacunas which par- 

 tially enclose the pharynx and eyes are 

 sinuses, since they have endothelial walls 

 and since they intervene between veins, 

 not between veins and arteries. 



The wide distribution of the capillary 

 vessels, the presence of an endotheliiun 

 around every blood-containing cavity 

 except possibly the heart, and the absence 



