^RT. 13 BRYOZOAN FAUNA CANU AND BASSLER 23 



All the setiform mandibles of the incriisting cheilostome colonies 

 appear to be rather organs of tactile sensibility than organs of 

 oxygenation, but we can not always understand their immediate 

 utility as well as in Microporella tractahilis. 



One time more we must consider the avicularia as organs of 

 relation. They are the eyes of animals that are without such organs. 

 By their presence and their nature they constitute an important 

 physiological perfection to be considered in the general classification. 



Our specimens were living and ovicelled. They were in repro- 

 duction and fixation on April 7-9, 1888. We have not observed the 

 ectocyst, probably because of the great desiccation of the specimens. 



Occurrence. — Galapagos Islands, D. 2813 and D. 2815. 



Cotypes.— Cat No. 8493, U.S.N.M. 



ENANTIOSULA, new genus 



Greek: Enantios: inverse, referring to the appearance of the cells; tila, suffix 

 indicating the absence of ovicell. 



Escharellidae ? Without ovicell. The zooecia are surrounded by 

 a common row of parietal dietellae. The frontal is a tremocyst. The 



"* B ^ D E F 



Figure 5. — Enantiosula manica^ new genus and species. A-G, Different forms of 

 OPERCULA, X 85. D-F, Mandibles of avicularium, X 85 



peristomice (apparent aperture) is semielliptic. The operculum has 

 the form of a bell with concave proximal border. There are two 

 oral avicularia with beak converging on the axis of the distal half 

 of the aperture. 



Genotype. — Enantiosula 77ianica, new species. Recent (equatorial 

 zone). 



ENANTIOSULA MANICA, new species 



Plate 3, Figures 6-11 



Description. — The zoarium is free, formed of many lamellae super- 

 imposed and covering one over the other like the fingers of a glove. 

 The zooecia are little distinct, separated by a shallow furrow, little 

 elongated wide, ansiform. The frontal is somewhat convex, orna- 

 mented with tremopores on the young cells and with radial costules 

 on the calcified ones. The apertura is semielliptical and transverse; 

 the peristome is distal and little salient. On each side of the apertura 

 there is an unguiculated avicularium adjacent to the peristome in 

 which the beak reaches the distal half of the apertura. 



