MUSEUM OF COMPARATIVE ZOOLOGY. 67 



EXPLANATION OF PLATES. 



TLATE I. 



Fig. 1. Distichoptilum gracile V. Stem and lower part of rachis, seen edgewise. 

 Enlarged 1^ times. 



" 1 a. The same. Terminal portion. Enlarged 2 diameters. 



" lb. The same. Spicula : c, one of the larger oblong forms from a calicle; 

 d, two from the stalk. Enlarged 75 diameters. 



" 2. Pennaiula aculeata. Side view of a medium-sized specimen. Natural 

 size. 



" 2 a. The same. Two of the polyps expanded. Drawn from a living exam- 

 ple. Enlarged about G diameters. 



" 3. Llalticina Finmarddca. Front view of the lower part of the rachis of a 

 small example, showing, below, the imperfectly developed polyps in 

 nearly simple series. Enlarged 2 diameters. 



" 3 a. The same. One of the mature polyps expanded. Drawn from a living 

 example. Enlarged about 8 diameters. 



" 4. Fiiniculina armata V. Portion of the middle of a large example. Natural 

 size. 



" 4 a. The same. One of the spicules of the calicles. Enlarged 75 diameters. 



" 4 b. The same. Portion of a younger example. Natural size. 



" 5. Kophobelemnon scabruiu V. Front view of the type-specimen, in alcohol. 

 Enlarged 2 diameters. 



" 5 a. The same. Back side. 



" 5 b. The same. Two of the spicula from the upper part of the stem : d, one 

 of the longer and nearly smooth prismatic spicula ; e, one of the smaller 

 warted spicula. Enlarged 150 diameters. 



" 5 c. The same. One of the larger, warted fusiform spicula, from the same 

 part. Enlarged 250 diameters. 



" G. Anlhoptiluin grandiflornm V. Portion showing two rows of polyps from 

 the middle region, side view ; a, a, zooids. Drawn from an alcoholic 

 example. Natural size. 



" 7, 8. Aiifliomasfus gmndiflorus V. Two small-sized examples, showing differ- 

 ent forms of the peduncle and root-like lobes. Natural size. 



" 9. The same. A very young example, with expanded polyps, natural size. 



" 10. The same. A young example, with the polyps nearly retracted. Natu- 

 ral size. 



" 10 a. The same. Spicula from the outer part of the cocnenchyma : c, one of 

 the longest warty fusiform spicula; d, one of the small rough double- 

 heads. Enlarged 150 diameters. 



