NO. 9 



MARINE INVERTEBRATES, ALASKA — MacGINITIE 



33 



Animals from measured rock 

 Annelids — continued 

 Terebellidae — continued 

 Lanassa venusta 

 Proclea graffi 

 Sabellidae 

 Chone duneri 

 Sahella crassicornis 

 Echinoderms (i sp., i spec.) : 



Ophiuran 

 Crustaceans (7 sp., 14+ spec.) 

 Cirripedes 

 Balanus crenatus 



Copepods (i sp., 2 spec.) : 

 Doropygus sp. 



Amphipods (5 sp., 53 spec.) 

 Maera danae 

 Protomedeia fasciata 

 Ericthonius hunteri 



Unidentified 

 Caprellid 

 Mollusks (2 sp., 3 spec.) : 

 Hiatella arctica 

 Lepeta caeca 

 Tunicates (6 sp., 41 spec.) : 

 Didemniim albidum 



Number and description 



Dendrodoa sp. 



Styela sp. (or Dendrodoa sp.) 



Styela sp. (or Dendrodoa sp.) 



Chelysoma macleayanum 

 Boltenia echinata 



I (young, with disk 1.5 mm. diam.) 



Numerous specimens i mm. across 

 base; 2 (4 mm. and 2.5 mm. across 

 base) 



2 (i female in each of two tunicates, 

 Boltenia echinata, measuring 25 x 17 

 mm. and 18 x 14 mm.) 



2(1 male, i ovig. female) 



I 



4 (2 males, 2 females with young just 



ready to hatch) 

 I 



2 (4.3 mm. and 7.5 mm. long) 

 I (8.5 mm. long) 



8 colonies (measuring, in mm., 18 x 12, 

 17 X ID, 14 X 8, 12 X 7, II X 8, II X 7, 

 8 X 7, 5 X 5 

 I (52 X 22 mm.) 

 4 (is, II, ID, and 7 mm. high) 

 13 (20, 17, IS, IS, 14, II, 10, 9, 8, 7, 2.S, 

 i.S, and 0.75 mm. high) 



3 (21 X 14, 18 X 14, and 5x4 mm.) 

 12 (length X height, 28 x 19, 25 x 17, 



19 X 15, 18 x 22, 18 X 14, 17 x 21, 

 15 X 20, II X 18, 7 X 7 mm., and 3 

 young individuals from 5 to 6 mm. 

 long) 



One face and four sides of this rock formed the habitat for more 

 than 200 individuals and colonies representing over 53 species. These 

 were growing on a surface of 786.15 square centimeters or approxi- 

 mately 125.78 square inches, a surface equivalent to an 11 -inch square. 



Another indication of marine invertebrate abundance was the identi- 



